UNITED STATESSECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORTPursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): January 3, 2018

FAIRMOUNT SANTROL HOLDINGS INC.(Exact name of registrant as specified in its charter)

Delaware 001-36670 34-1831554

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

8834 Mayfield Road, Chesterland, Ohio 44026

(Address of Principal Executive Offices) (Zip Code)

(800) 255-7263Registrant’s telephone number, including area code

Not ApplicableFormer name or former address, if changed since last report

ChecktheappropriateboxbelowiftheForm8-Kfilingisintendedtosimultaneouslysatisfythefilingobligationoftheregistrantunderanyofthefollowingprovisions:

☒ WrittencommunicationspursuanttoRule425undertheSecuritiesAct(17CFR230.425)

☐ SolicitingmaterialpursuanttoRule14a-12undertheExchangeAct(17CFR240.14a-12)

☐ Pre-commencementcommunicationspursuanttoRule14d-2(b)undertheExchangeAct(17CFR240.14d-2(b))

☐ Pre-commencementcommunicationspursuanttoRule13e-4(c)undertheExchangeAct(17CFR240.13e-4(c))

IndicatebycheckmarkwhethertheregistrantisanemerginggrowthcompanyasdefinedinRule405oftheSecuritiesActof1933(§230.405ofthischapter)orRule12b-2oftheSecuritiesExchangeActof1934(§240.12b-2ofthischapter).

Emerginggrowthcompany☐

Ifanemerginggrowthcompany,indicatebycheckmarkiftheregistranthaselectednottousetheextendedtransitionperiodforcomplyingwithanyneworrevisedfinancialaccountingstandardsprovidedpursuanttoSection13(a)oftheExchangeAct.☐

Item 8.01. Other Events.

FairmountSantrolHoldingsInc.(“Fairmount”)intendstoprovidesupplementalinformationregardingitsproposedtransactionwithUniminCorporation(“Unimin”).AcopyoftheinvestorpresentationisattachedheretoasExhibit99.1andisincorporatedbyreferenceherein.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

ThisCurrentReportonForm8-Kcontainsstatementswhich,totheextenttheyarenotstatementsofhistoricalorpresentfact,constitute“forward-looking”statementswithinthemeaningofSection21EoftheSecuritiesExchangeActof1934,asamended,andthePrivateSecuritiesLitigationReformActof1995.Allforward-lookingstatementsinvolverisksanduncertaintiesthatmaycauseactualresultstodiffermateriallyfromthoseexpressedorimpliedintheforward-lookingstatements.ImportantfactorsthatcouldcauseactualresultstodiffermateriallyfromthoseanticipatedorimpliedinforwardlookingstatementsaredescribedinFairmount’sForm10-Kundertheheading“CautionaryStatementRegardingForward-LookingInformation”,aswellastheinformationincludedinFairmount’sCurrentReportsonForm8-Kandotherfactorsthataresetforthinmanagement’sdiscussionandanalysisofFairmount’smostrecentlyfiledreportswiththeSEC.Additionalimportantfactorsthatcouldcauseactualresultstodiffermateriallyfromthoseindicatedbyforward-lookingstatementsincluderisksanduncertaintiesrelatingto:themergernotbeingtimelycompleted,ifcompletedatall;ifthemergeriscompleted,theimpactofanyundertakingsrequiredbythepartiesinordertoobtainregulatoryapprovals;priortothecompletionofthemerger,Fairmount’sand/orUnimin’srespectivebusinessesexperiencingdisruptionsduetotransaction-relateduncertaintyorotherfactorsmakingitmoredifficulttomaintainrelationshipswithemployees,businesspartnersorgovernmentalentities;theindustrymaybesubjecttofutureregulatoryorlegislativeactionsthatcouldadverselyaffectFairmount’sand/orUnimin’srespectivebusinesses;andthepartiesbeingunabletosuccessfullyimplementintegrationstrategies.WhileFairmountand/orUniminmayelecttoupdateforward-lookingstatementsatsomepointinthefuture,FairmountandUniminspecificallydisclaimanyobligationtodoso,evenifestimateschangeand,therefore,youshouldnotrelyontheseforward-lookingstatementsasrepresentingourviewsasofanydatesubsequenttotoday.

Additional Information

Inconnectionwiththeproposedtransaction,aregistrationstatementonFormS-4willbefiledwiththeSEC.FAIRMOUNTSTOCKHOLDERSAREENCOURAGEDTOREADTHEREGISTRATIONSTATEMENTANDANYOTHERRELEVANTDOCUMENTSFILEDWITHTHESEC,INCLUDINGTHEPROXYSTATEMENT/PROSPECTUSTHATWILLBEPARTOFTHEREGISTRATIONSTATEMENT,WHENTHEYBECOMEAVAILABLE,BECAUSETHEYWILLCONTAINIMPORTANTINFORMATIONABOUTTHEPROPOSEDMERGER.Thefinalproxystatement/prospectuswillbemailedtostockholdersofFairmount.InvestorsandsecurityholderswillbeabletoobtainthedocumentsfreeofchargeattheSEC’swebsite,www.sec.gov,orfromFairmountatitswebsite,www.fairmountsantrol.com,orbycontactingIndraniEglestonat440-214-3219orMatthewSchlarbat440-214-3284.

Participants in Solicitation

Fairmountanditsrespectivedirectorsandexecutiveofficersmaybedeemedtobeparticipantsinthesolicitationofproxiesinrespectoftheproposedmerger.InformationconcerningFairmount’sparticipantsissetforthintheproxystatement,datedApril6,2017,forFairmount’s2017AnnualMeetingofstockholdersasfiledwiththeSEConSchedule14A.Additionalinformationregardingtheinterestsofsuchparticipantsinthesolicitationofproxiesinrespectoftheproposedmergerwillbeincludedintheregistrationstatementandproxystatement/prospectusandotherrelevantmaterialstobefiledwiththeSECwhentheybecomeavailable.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.Exhibit Number Description

99.1 InvestorPresentation,datedasofJanuary3,2018

Exhibit IndexExhibit Number Description

99.1 InvestorPresentation,datedasofJanuary3,2018

SIGNATURES

PursuanttotherequirementsoftheSecuritiesExchangeActof1934,theregistranthasdulycausedthisreporttobesignedonitsbehalfbytheundersignedhereuntodulyauthorized.

Fairmount Santrol Holdings Inc.(Registrant)

By: /s/MichaelF.Biehl MichaelF.Biehl

ExecutiveVicePresidentandChiefFinancialOfficer

Date:January3,2018

January2018CreatingaLeaderinProppantandIndustrialMaterialsSolutionsExhibit99.1

CAUTIONARYSTATEMENTREGARDINGFORWARD-LOOKINGINFORMATIONThiscommunicationcontainsstatementswhich,totheextenttheyarenotstatementsofhistoricalorpresentfact,constitute“forward-looking”statementswithinthemeaningofSection21EoftheSecuritiesExchangeActof1934,asamended,andthePrivateSecuritiesLitigationReformActof1995.Allforward-lookingstatementsinvolverisksanduncertaintiesthatmaycauseactualresultstodiffermateriallyfromthoseexpressedorimpliedintheforward-lookingstatements.ImportantfactorsthatcouldcauseactualresultstodiffermateriallyfromthoseanticipatedorimpliedinforwardlookingstatementsaredescribedinFairmountSantrol’sForm10-Kundertheheading“CautionaryStatementRegardingForward-LookingInformation”,aswellastheinformationincludedinFairmountSantrol’sCurrentReportsonForm8-Kandotherfactorsthataresetforthinmanagement’sdiscussionandanalysisofFairmountSantrol’smostrecentlyfiledreportswiththeSEC.OtherfactorswillbesetforthinaregistrationstatementwhichUniminintendstofilewiththeSEC.Additionalimportantfactorsthatcouldcauseactualresultstodiffermateriallyfromthoseindicatedbyforward-lookingstatementsincluderisksanduncertaintiesrelatingto:themergernotbeingtimelycompleted,ifcompletedatall;ifthemergeriscompleted,theimpactofanyundertakingsrequiredbythepartiesinordertoobtainregulatoryapprovals;priortothecompletionofthemerger,FairmountSantrol’sand/orUnimin’srespectivebusinessesexperiencingdisruptionsduetotransaction-relateduncertaintyorotherfactorsmakingitmoredifficulttomaintainrelationshipswithemployees,businesspartnersorgovernmentalentities;theindustrymaybesubjecttofutureregulatoryorlegislativeactionsthatcouldadverselyaffectFairmountSantrol’sand/orUnimin’srespectivebusinesses;andthepartiesbeingunabletosuccessfullyimplementintegrationstrategies.WhileFairmountSantroland/orUniminmayelecttoupdateforward-lookingstatementsatsomepointinthefuture,FairmountSantrolandUniminspecificallydisclaimanyobligationtodoso,evenifestimateschangeand,therefore,youshouldnotrelyontheseforward-lookingstatementsasrepresentingourviewsasofanydatesubsequenttotoday.AdditionalInformationInconnectionwiththeproposedtransaction,aregistrationstatementonFormS-4willbefiledwiththeSEC.FairmountSantrolSTOCKHOLDERSAREENCOURAGEDTOREADTHEREGISTRATIONSTATEMENTANDANYOTHERRELEVANTDOCUMENTSFILEDWITHTHESEC,INCLUDINGTHEPROXYSTATEMENT/PROSPECTUSTHATWILLBEPARTOFTHEREGISTRATIONSTATEMENT,WHENTHEYBECOMEAVAILABLE,BECAUSETHEYWILLCONTAINIMPORTANTINFORMATIONABOUTTHEPROPOSEDMERGER.Thefinalproxystatement/prospectuswillbemailedtostockholdersofFairmountSantrol.InvestorsandsecurityholderswillbeabletoobtainthedocumentsfreeofchargeattheSEC’swebsite,www.sec.gov,orfromFairmountSantrolatitswebsite,www.FairmountSantrol.com.ParticipantsinSolicitationFairmountSantrol,Uniminandtheirrespectivedirectorsandexecutiveofficersmaybedeemedtobeparticipantsinthesolicitationofproxiesinrespectoftheproposedmerger.InformationconcerningFairmountSantrol’sparticipantsissetforthintheproxystatement,datedApril6,2017,forFairmountSantrol’s2017AnnualMeetingofstockholdersasfiledwiththeSEConSchedule14A.Additionalinformationregardingtheinterestsoftheparticipantsinthesolicitationofproxiesinrespectoftheproposedmergerwillbeincludedintheregistrationstatementandproxystatement/prospectusandotherrelevantmaterialstobefiledwiththeSECwhentheybecomeavailable.DisclaimerandForwardLookingStatements

NoteonGAAPandIFRSReportingStandardsFairmountSantrolpreparesitsfinancialstatementsinaccordancewithU.S.generallyacceptedaccountingprinciples,orGAAP,whileUnimincurrentlypreparesitsfinancialstatementsinaccordancewithInternationalFinancialReportingStandards,orIFRS,asissuedbytheInternationalAccountingStandardsBoard.Asaresult,thefinancialinformationofFairmountSantrolandUniminmaynotbedirectlycomparable.Inaddition,thecombinedcompanyinformationhasbeenpreparedbasedonasimplearithmeticsumoftheresultsofFairmountSantrolandUnimin,andwasnotpreparedinaccordancewithRegulationS-XoftheSEC’srulesforproformafinancialinformation,andyoushouldthereforenotplaceunduerelianceonthisinformation.InformationregardingUnimin’sresultswillbepresentedintheregistrationstatementorFormS-4inaccordancewithUSGAAPandthereforemaydifferfromtheequivalentinformationpresentedherein.FinancialForecastsTheinformationcontainedhereinincludescertainnon-publicfinancialforecasts,statements,estimatesandprojections(collectively,the“financialforecasts”)withrespectto,amongothermatters,anticipatedfutureperformanceofFairmountSantrolandUniminandanticipatedindustrytrends.Thesefinancialforecastsareinherentlybasedonvariousestimatesandassumptionsthataresubjecttothejudgmentofthosepreparingthem.Thesefinancialforecastsarealsosubjecttosignificanteconomic,competitive,industryandotheruncertaintiesandcontingencies,allofwhicharedifficultorimpossibletopredictandmanyofwhicharebeyondthecontrolofFairmountSantrolandUnimin.Therecanbenoassurancethatthesefinancialforecastswillberealizedorthatactualresultswillnotbesignificantlyhigherorlowerthanforecasted.Thefinancialforecastscovermultipleyearsandbecomesubjecttogreateruncertaintywitheachsuccessiveyear.Inaddition,thefinancialforecastsalsoreflectassumptionsthataresubjecttochangeanddonotreflectrevisedprospectsforFairmountSantrol’sandUnimin’sbusinesses,changesingeneralbusinessoreconomicconditionsoranyothertransactionoreventthathasoccurredorthatmayoccurandthatwasnotanticipatedatthetimethefinancialforecastswereprepared.ThefinancialforecastswerenotpreparedwithaviewtowardpublicdisclosureortowardcomplyingwithU.S.GAAP,thepublishedguidelinesoftheSECregardingprojectionsandtheuseofnon-GAAPmeasuresortheguidelinesestablishedbytheAmericanInstituteofCertifiedPublicAccountantsforpreparationandpresentationofprospectivefinancialinformation.Asaresult,theinclusionofthefinancialforecastsinthisdocumentshouldnotbereliedonasnecessarilypredictiveofactualfutureeventsorresults.NoneofUnimin,FairmountSantrolortheirrespectiveaffiliates,advisors,officers,directorsorotherrepresentativescanprovideanyassurancethatactualresultswillnotdifferfromthefinancialforecastspresentedherein.NoneofUnimin,FairmountSantrolortheirrespectiveaffiliates,advisors,officers,directorsorrepresentativeshasmadeormakesanyrepresentationregardingthecombinedcompany’sultimateperformancecomparedtotheinformationcontainedinthefinancialforecastsorthatforecastresultswillbeachieved.DisclaimerandForwardLookingStatements

CreatingValuethroughScale,Diversity,andComplementaryAssetsTakingintoaccountvaluecreationfromrelativecontribution,valueofindustrialbusiness,$170Mcashconsideration,andshareof$1billionvaluefromsynergiesasdescribed,forillustrativepurposes,onpage19LTM9/30/2017SignificantValueCreationtoFMSAShareholdersValuecreationleverssuggest55-70%increasetopre-transactionsharevalue(1)35%ownershipprovidesapremiumaboverelativecontribution,includingcontributionofUnimin’sleadingandpredictablygrowingindustrialmineralsbusiness$170MincashconsiderationfromUniminPro-rataparticipationin>$1Bnofvaluefrom$150Minannualsynergies;tobefullyrealizedbyyear2aftercloseCompellingFinancialProfileSignificantcombinedearningspower,compoundedby~$150MannualsynergiesStrongfreecashflowgenerationthrough-the-cycle,drivingflexibilityincapitalallocation:RapiddeleveragingofbalancesheetRangeofopportunitiesfororganicinvestmentandreturnofcapitalLeadingMaterialsSolutionsProviderLeadershippositionacrosstwocomplementarybusinesssegments–EnergyandIndustrialThemostextensiveproductportfolio,includingbest-in-classtechnologyportfolioUniqueabilitytodeliverhighvolumerequirementsthroughvast,fullyintegratedsupplynetworkGrowthOpportunities&StabilityThroughDiversityDoublingourparticipationinproppantintensitytrendsSignificantlymultiplyingourindustrialexposurewithover$240Mingrossprofitandvolumesnearing15Mtonsperannum(2)Predictable,growingindustrialbusinessatcompellingmultiplevs.publicpeers

CompellingTransactionforAllStakeholdersBasedonfullydilutedsharesoutstandingof229.9MMasof12/8/2017usingthetreasurystockmethodIncludingtargetedsynergiesofapproximately$150MMFairmountfinancialspreparedunderUS-GAAP;UniminfinancialspreparedunderIFRSwithAdjustedEBITDAdevelopedconsistentwithFairmountmethodologyforcomparabilitypurposesCombinednetdebtadjustedforcertainitemsincludingtheOIDontheFairmountTLB;proformafortransactionexpensesAsofCOB12/8/2017(measurementdateinthemergeragreement)TransactionStructureFairmountSantroltocombinewithUnimin,awholly-ownedsubsidiaryofSibelcoCombinedcompanytolistonNYSEconcurrentwithclosingConsiderationandProFormaOwnershipFairmountSantrolshareholderswillown35%astronger,well-positionedcompany,plusreceivecashconsiderationof$170M(approximately$0.74pershareatcurrentdilutedsharecount)(1)Unimin’sparentcompany,Sibelcowillown65%ofthecombinedcompanyLTMSep-17AdjustedEBITDAof~$400M(~$550Mincl.run-ratesynergies)(2)(3)FinancingUniminhassecuredcommitmentsof$1.65Bntorefinancecombinednetdebtof$1.5Bn(4),representing2.8xLTMSep-17AdjustedEBITDA(postsynergies)or2.1xQ3‘17AnnualizedEBITDA(postsynergies)BoardandGovernanceAfterclose,JennifferDeckardtobeChiefExecutiveOfficerandamemberoftheBoardofDirectorsBoardofDirectorsisexpectedtocomprise11members:theCEO;sixdirectorsnominatedbySibelcoincludingtheChairman;fourdirectorsnominatedbyFairmountSantrolSibelcoCEOJean-LucDeleersnydertojointheBoardofDirectorsClosingTransactionexpectedtoclosemid2018SubjecttotheapprovalofFairmountSantrolshareholdersShareholdersowning26%ofoutstandingshareshaveenteredintovotingagreements(5)RegulatoryapprovalsrequiredOthercustomaryclosingconditions

FairmountSantrol–Long-TermValueCreatorsBroadProppantPortfoliowithHighTechnologyProductsSuiteofproductsaddressallwellenvironments(NWS,TexasGold,Permian,RCS,SSP)Aleaderinproppanttechnologyandinnovationwithlargestportfolioofresin-coatedproductsandPropelSSP®NationalScale/Footprint~900MtonsofprovenreservesacrossOhio,Illinois,Wisconsin,Minnesota,MissouriandTexasAbilitytoadjustproductionmixbygradetobettermeetdemandAbilitytoshiponmultipleClass1raillinesandserveallkeybasinsFocusonValueEnhancingLogistics46in-basinoil&gasterminals;12I&RterminalsExtensivedistributionandunittraincapabilitiesreducein-basincostandincreaseeffectiveutilization12unittraincapableoil&gasterminals;over70%ofNWSshippedviaunittrainCompellingI&RBusinessFullyintegratedI&RsandandresinsolutionsproviderDiversebaseofover800customerscontributestothemoresteadydynamicsofI&RProvidesforstable,predictablecashflowsLong-LastingCustomerRelationshipsCustomersincludethelargestpressurepumpersintheU.S.,aswellasregionalplayersStrongcustomerbasewithlongstandingrelationships70-80%ofproductioniscontractedwithweightedaveragedurationof~4years

Section1OverviewofUnimin

SignificantAdj.EBITDAThrough-The-Cycle(2)(3)$MIndustrial54%DiverseGeographiesVarietyofMineralsUnimin–AnIndustryLeaderKeyHighlightsTwoComplementarySegments(1)Energy46%28MtCurrentCapacity39PlantsLeaderInSafety38OperatingTerminals>450MtReserves~9,500Railcars~2,300EmployeesAccesstoFiveClass1Railroads10MineralsSoldDiverseEndUses(4)LTM9/30/2017;volumesplitbysegmentfortoppiechart,revenuesplitforIndustrialsegmentfortwobottompiechartsSG&Aandothercorporatecostitemsallocatedbyvolumecontribution;financialsaccountedforunderIFRSwithAdj.EBITDAdevelopedconsistentwithFairmountmethodologyforcomparabilitypurposesExcludesUnimin’shighpurityquartzbusinesswhichwillremainwithSibelcoUnimin’sIndustrialproductsaresoldintoavarietyofindustriesincluding:Glass,Ceramics,MetalsandCastings,Construction,Coatings,Polymers,andOthervariousindustriesIndustrialMaterialsProppantSolutions

Unimin’sOptimizedPlant&LogisticsNetworkPlantsO&GTerminalIndustrialTerminalNSOCanadaMexicoKeyStatistics(1)Plants:3928plantsandtwoRCSfacilitiesinUSA9PlantsinMexico2PlantsinCanada12Hybrid,23industrialand4energyplantsMorethan13plantswithcapacityofover1MtTerminals:38ofwhich32energyIncludesidledplantsandterminalsUniminWestTexasplantcurrentlyunderconstructionwithexpectedcompletionin2Q18Note:SeeappendixforselectedassetdescriptionsJáltipanSanJuanTlaxcalaAhuazotepecSanJoséBenitoJuárezApodacaCanoitasLampazosVocaCleburneTroupSibleyRoffGuionTuscaloosaCaleraJunctionCityMcIntyreHephzibahLugoffMarstonCamdenElcoTammsHuntingburgPevelyUticaTroyGroveOregonTunnelCityPortageKasotaOttawaGoreDividingCreekSt.CanutEmmettCrane(2)

Unimin’sMineralsServeaWideVarietyofIndustriesceramicspolymersglasscoatingsoil&gasmetalsconstructionSilica✓✓✓✓✓✓✓FeldsparOlivineClay&KaolinLimeNephelineSyenite✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓Diversityacrossmineralsandmarketsprovidesresilientperformanceandmultipleavenuesofgrowth✓✓

Unimin’sEnergyBusinessALeadingSupplierofProppantstotheO&GSegmentsWellCementingAdditivesGravelPackingSandRawSandCoatedSandHighqualityreservesproducemonocrystallinesilicagrainsthatarespherical,strongerandhavesuperiorparticlesizedistribution(withinAPIspecifications)LowerfinesandturbidityReadilyavailablethankstoourscaleanddeliveryinfrastructureDrillingProductsSuperiorresin-coatedUNIFRAC®productsEngineeredhybridproductencompassingprecuredstrengthperformanceandreliableflowbackcontrolSuperiorcrushstrengthupto20,000psiOnlycoatedonpremiumUNIFRAC®substratesTexasBrownBrandNorthernWhiteNorthernWhiteTexasBrownBrandBrandPlantsTerminalsBenwood,WVOdessa,TX(Permian)TunnelCity,WIRoff,OKKeyHighlightsSelectedFlagshipPlants&TerminalsComprehensiveportfolioofAPIqualityquartzproppants,resincoatedsands,cementingadditives,gravelpackingmedia,anddrillingmudadditivesAvailableworldwide,theseengineeredproductsoptimizedrillingoperationsandcompletionstoensurewellintegrityandmaximizefractureconductivityApplicationsincludedrilling,cementing,stimulation(hydraulicfracturing),production

Unimin’sIndustrialBusinessKeyHighlightsDiverseCustomerSegmentsServedLarge,Resilient,andGrowingBusinessGeneratingStrongCashFlowsHighlyresilientandgrowingbusinessgeneratingstrongcashflowswithannualgrossprofitinexcessof$180M(1)Large,stablebluechipcustomerbaseBest-in-classandgeographicallydiverseassetbaseStrategicallylocatedplantsintheUSHighqualityplantsinMexicoservinggrowingmarketsCanadiannephelinesyeniteplantbeingmodernizedandexpandedtoservegrowingmarketsOwnedandoperatedprivaterailroadinWestVirginia&NewJersey(“Winchester&Western”)furtherenhancingUnimin’sindustrialsupplychainlogisticsGlassContainer,float,fiberglass,solarpanels,displaysStrongcashflowgeneratorLongtermcontractualpositionsConstruction&IndustrialProductsConstruction,chemical,consumer,environmental,engineeredstoneConstructiondrivinggrowthHighlyfragmentedmarketCeramicsSanitaryware&tileapplicationsHousingconstructionmaindriverforproductiongrowthCoatings&PolymersIndustry’slargestportfolioofmineralsservingarchitecturalpaints,industrialcoatings,adhesives,plasticapplicationsMetals&CastingsWiderangeofrefractory&metallurgicalgradesDiversemetalcasting,moldingandcore-makingapplicationsUniminfinancialspreparedunderIFRSNote:Seeappendixforadditionalinformationontheindustrialsegment

UniminHasaPredictableandProfitableIndustrialBusinessFurtherexpectedgrowthfromvariouscustomersandindustriesservedPredictableUniminIndustrialVolumes2015A-17ECAGR:3%Average2015A–2017EGrossProfitMargin(%)(2.5%)(9%)(2%)3%1%%WorstGrossProfitYoYChange(2)(1)(25%)PredictableProfitabilityIndustrialMineralsAttributesUniminhasbest-in-classgrossprofitmarginscomparedtolistedindustrialpeersHighlyresilientindustrialbusinessdeliversmuchlessvolatilitythantheproppantmarketAverageofFMSA,SLCA,HCLP,EMESCalculatedaslargestyearoveryearpercentagedecreaseorsmallestpercentageincreaseofgrossprofitovertheperiodNote:Historicalgrossprofitasreported;forecastsbasedonbrokerconsensus(73%)ResilientandpredictableearningsandcashflowprofileDiversityincustomers,industriesandgeographiesProductdifferentiationthroughperformanceandspecification,ratherthancostCloseandlongstandingcustomerrelationshipsExpectedgrowthinexcessofGDPfromnewproducts,innovationandgeographicexpansion

FinancialOverviewofUniminUniminfinancialspreparedunderIFRSwithGrossProfit,SG&AandEBITDAadjustedfornon-recurringitems.OutlookStrongoutlookforenergygrowth:CapacityadditionsProppantcontractsalignedwithmarketpricingIndustrywidepricingtrendsCostsavingsfromhighvelocityterminals2018outlook:ExpectedmarginrecoveryinMexicofollowing2017disruptionsNewvalue-addedhighermarginproductsFavorablevolumeandmixshifttrends2017YTDreflectiveofcurrentenvironmentUniminKeyFinancialsOverview(1)EnergyGrossProfitTotalGrossProfitSG&AAdjustedEBITDAIndustrialGrossProfitEnergyVolumesIndustrialVolumes2015A2016AYTD9/30/2017A$118$38$119$55$303$228$265$100$(89)$(86)$(73)$(26)$214$142$192$74$185$190$146$453Q177.86.88.43.111.512.29.23.1AllfiguresinMillions

UniminisGrowingRapidlyandPoisedtoExpandFurtherMtGrowththroughCapacityExpansionandOperationalEfficiencyInvestmentsIndustrialMaterialsProppantSolutionsSufficientcapacityinplacetomeetgrowingdemandofenergyandindustrialbusinessesinkeygeographiesandindustriesSignificantexpansionsthroughout2017Over1MtonsofannualproppantcapacityGreaterthan300kofindustrialcompletedinQ3‘17WestTexasandUticaexpansionsunderwaytoaddressmarketneedsHighvolumeterminalexpansionsinPermianandMarcellusAttractivebrownfieldpotentialexpansionsacrosstheportfolioKeyDriversPermianandUtica(1)ExpansionUticaexpansioncommissionedinQ4’17andavailableforfullyear2018

Sibelco–Long-termShareholderSharedValuesandGlobalExpertiseLongtrackrecordandexperienceinworkingwithindustrialmineralscompaniestocreatevalueFocusonsustainabledevelopmentandreturnsaslong-termshareholderIn-depthknowledgeofworldmarketswithglobalcustomerrelationshipsLeadingtechnologiesinmineralsprocessingwithauniqueR&DplatformTrulyglobalplatform&distributionnetworkVisionTobethebestglobalmaterialsolutionscompany:marketdriven,operationallyexcellent,withacompellingcultureFoundedin1872Sibelco’sKeyStrengths2016salesof€2.7BnMulti-mineralproductoffering>200plantsin>40countries~10,000employeesBelgian,privately-owned

DiversityInMineralsProducedAnd......EndMarketsServedSibelco–Supportive,Value-AddedBusinessPartnerSibelco–KeyHighlightsSibelcoandtheCombinedCompanySibelcoisnotalistedcompany;sharesaretradedontheOTCEuronextExpertMarketAleadingglobalproducerofindustrialmineralswithoperationsin>40countriesFoundedin1872andstillprivatelyowned(1)HeadquarteredinAntwerp,BelgiumPresentacrossthevaluechain2016revenuesof€2.7BnandstrongfinancialpositionWidevarietyofminerals&endmarketsStrongtrackrecordofsustainabledevelopmentMajorityownerofUniminsince1973(currentlywhollyownedsubsidiary)SibelcowillsupportNewCothroughitsleadingtechnologiesinmineralsprocessing,in-depthknowledgeofglobalmarketsandexperienceinmanagingindustrialmineralscompaniesThecombinedentitywillbenefitfromSibelco’sworldwidesalesforcetodistributeNewCo’sproductsonaglobalscalewhiledistributingcertainSibelcomineralsinNewCo’skeysegmentsTrackrecordofapplyingthe“SibelcoModel”tonewbusinessesandcreatingvalueforallstakeholdersQuartzResinCoatedSandSilicaTalcWollastoniteProppantManganeseDioxideMineralSandsNephelineSyeniteOlivineOthersIronOxideLimeLimestoneMagnesiaMagnetiteClay&KaolinCristobaliteDolomiteFeldsparGlassCulletAluminiumTrihydrateBariteBentoniteCalciumCarbonateChromiteAgricultureConstruction&EngineeringGlassCeramicsElectronicMining&MetallurgyCoatings&PolymersEnergySports&Leisure

Section2ValueCreationforFairmountShareholders

SignificantValueCreationforFairmountSantrolShareholdersIllustrativeBottoms-UpBuildUpofValueCreationperFairmountShare(1)$/share12343–5xmultiplepremium$170Mcashconsideration(3)Basedonfullydilutedsharesoutstandingof229.9Masof12/8/2017usingthetreasurystockmethodValueupliftrangeshownbasedonpre-announcementFairmountsharepriceof$5.04asof12/11/2017andpre-rumorFairmountsharepriceof$4.57asof10/2/2017(novalueattributedtoRelativeContributionatSameMultiplebarinthechart)Valueofindustrialbusinessatillustrative3.0–5.0xmultipletimeshigherthancontributioninappliedto$138MofUniminindustrialLTMEBITDA(basedonLTMindustrialgrossprofitless54%oftotalUniminSG&A)*35%ownership55-70%ValueUplift(2)1(2)

Ownershipof35%forFairmountShareholdersImpliesaPremiumEvenatComparableBaseMultiplesFairmountOwnershipImpliedbyEBITDAContributiontoCombinedCompany(1)RelativecumulativeEBITDAcontribution(like-for-likebasis).Adjustedfornetdebt(Fairmount:$632M;Unimin:$831M)byapplyingtheimpliedFairmountEBITDAmultipletoUniminEBITDA(foreachperiod)35%OwnershipforFMSA1AdjustedforcapitalstructuretotakeintoaccountthatFairmountcontributesover-proportionallytocombinednetdebt(43%oftotal)ThisanalysissimplisticallyvalueseverydollarofEBITDAidentically;excludesanypremiumforpredictableUniminindustrialbusinessUniminFairmount

ValueofStabilityReflectedinIndustrialTradingMultiplesIndustrialmineralscompaniestradeatmeaningfullyhighermultiplesthanproppantcompanies,andwithlessvolatilityduetobusinessmodelstability42%ofcombinedcompanies’LTM9/30/2017grossprofitderivedfromindustrialmaterialssolutionsResilientearningsstreamgeneratedfromdiverseproducts,industries,customersandgeographiesthroughoutNorthAmericaProppantMultiples(1)IndustrialMultiples(1,2)TEVmultipleof2018EEBITDAmedianconsensusfromFactSetasof12/29/17GroupbasedonpeersperFairmountSantrolproxystatementfiled4/6/2017(TronoxLtd.excluded)TEV/2018EEBITDATEV/2018EEBITDA23%ofLTMgrossprofitfromIndustrial28%ofLTMgrossprofitfromIndustrial256%ofUnimin’sLTMgrossprofitfromIndustrialUnimin’sindustrialbusinessismorediversethanitsclosestcompetitors

IndicativeTransactionSources&UsesIndicativeTransactionSources&Uses–AsofSeptember30,2017Sources($M)TotalNewCoSources$1,650NewCoTLBUses($M)TotalNewCoUses$630RefinancingofFairmountNetDebt(1)$830RefinancingofUniminNetDebt$115CashonBalanceSheet$75IllustrativeTransactionExpenses$1,650$1,650Proformafortherefinancingcompleted11/01/2017,adjustedforcertainitemsincludingOIDanddeferredfinancingcostsBasedonfullydilutedsharesoutstandingof229.9Masof12/8/2017usingthetreasurystockmethod$170CashfromUnimin$170CashtoFairmountShareholders3Inadditionto35%proformaownership,Fairmountshareholdersaretoreceivecashconsiderationof$170M(~$0.74pershare(2))fromUniminExpectedtobeatax-freestock-for-stockexchangewithanygainintheFairmountstockrecognizedonlyuptotheamountofcashreceived

>$1Bn(1)ValueCreationfromQuantifiedSynergiesBasedonnetpresentvalueSynergysplitbasedon2020annualestimatesbycategory4Rigoroussynergyanalysisperformedbyleadingconsultantsovertwomonthsincleanroomsetting3rdpartymodelassumesImmediateandSubstantialSynergiesExpectedatLowImplementationCosts(2)Origin-DestinationPairOptimizationCapExBenefitsAccountConsolidationProcurementG&ATargetedsynergiesofapproximately$150Mannually50%ofsynergiesexpectedinyear1withfullrun-rateachievedinyear2Additionalsynergiesfromcapexoptimizationof$30-40MoverthreeyearsStrongpotentialforincrementalsynergiesnotincludedin$150MCrossselling(industrial+energy)FurtherproductdevelopmentSynergyestimatesdevelopedthroughthirdpartymarketmodelincorporatingsignificantin-basincapacitybuildFracsanddemandgrowsat16%annuallyfrom2017-2020SignificantPermianandEagleFordcapacitycomingonline

Section3MarketDynamics

ExpectedIncreaseinProppantDemandfor2018AverageProppantTonsperU.S.HorizontalWell4,600-5,0005,600-6,0003,600-4,0006,500-7,0002018Proppantdemandforecastedtoreach100milliontons(vs.~75milliontonsin2017)U.S.HorizontalLandRigCountHigheraveragerigcountvs.2017Increasingproportionofhorizontalvs.verticalwellsHigherproportionofwellsdrilledactuallycompletedWellinventorydrawdowns(reversalof2017DUCbuild)ModestlylongerlateralsMorestagesperwellHigherproppantloadingperlateralfootIncreasingNumberofWellCompletions(1)HigherProppantIntensityPerWell(2)BakerHughesUShorizontallandrigcountFMSAestimatesbasedonpublicE&Ppresentationsandinternalestimates+PacWestConsultingPartners

GrowingDemandAcrossallBasinsExpected2018demandtobesuppliedbybothNorthernWhiteandLocal/RegionalsandsMillionsoftonsOver50%growthoutsidethePermian100MTonsin2018Coarse40/70100Mesh40/70DemandtobesuppliedfromsourcesoutsideofthePermianrepresentsmajorityof2018demandThecombinedcompanyisinprimepositiontomeetthisdemandwithbroadproductoffering,therightgrademixandleadingoperationsandlogisticsnetworkAportionof40/70andallcoarsergradesofPermiandemandwillcontinuetobesuppliedfromoutsideofthePermian~80%ofPermianproductionisexpectedtobe100meshand20%expectedtobe40/70InsufficientPermianproductionof40/70meshOversupplyofPermianproduced100meshexpectedKeyassumptions:50MtonsofPermiandemandand35Mtonsofaveragenameplatecapacityin2018(~45Mtonsofnameplatebyendof2018)Permiandemandis40%100mesh,40%40/70and20%coarsegradesin2018Permianproductionis80%100meshand20%40/70in2018Conservativelyassumes100%adoptionoflocalPermiansandsSource:Managementestimates*Supplysourceindicatestheregionfromwheresupplyisbeingproducedtomeetdemandandnotindicativeofnameplatecapacity2016TotalDemand2017Est.TotalDemand2018Est.TotalDemand2018Est.SupplySource*tomeetDemand100Mesh

WellSuitedtoMeetDemandAcrossAllBasinsNorthernWhiteSupplierofChoiceinallBasinsStrongPermianFootprint~75MtonsNorthernWhiteDemandMix(Permian+RestofNorthAmerica)Unimin/FMSANon-PermianProductionbyGradeMarketSupplyforNon-PermianProductionbyGradeProductionbygradewellbalancedtomeetdemandScale,plantlocationsandterminalnetworkmakeUnimin/Fairmountalow-costsupplierofhighqualitysandsinallbasins(alsoseepage29)Twoplants,eachwith3milliontonsofannualcapacity;differentlocationshelpreducelastmileforcustomerStrategiclocationofPermianterminalsaidsindistributionofbothlocalandNWSandhelpsbridgetiminggapbetweenPermianproductionandcustomerordersComplementsotherproductsbyofferingsolutiontocustomersprimarilyfocusedonreducingcostsAbilitytoflexcombinedPermianproductionof40/70upto38%dependingonmarketdemandOptiontoincreasecapacitybyadditional3MtSeepage28foradditionaldetailSource:Managementestimates

PermianAssetsStrategicallyPlacedtoMeetLocalNeedsUniminTerminalsFairmountSantrolPlantFairmountSantrolTerminalsCombined6milliontoncapacityTwoplantsindifferentlocationswithattractivegrademixScheduledtocomeonlineinQ2‘18StrategicallylocatedterminalnetworkOptiontoincreasecapacitybyadditional3MtDrillingActivityUPBNSFTXPF(shortlinetoBN)UniminPlantCarlsbadHobbsLamesaSnyderBigSpringMidlandOdessaSanAngeloPecosRiver~50-75Miles(1)CombinedFMSA/UniminProductionbygradeinthePermianNote:Locationsrepresentedasaccuratelyaspossible,indicativeonly.35mileslineardistance;c.50-75milesbyroaddependingonroute

CombineddistributionnetworkhasaccesstomajorrailroadsCombinedterminalnetworkincreasesthroughputcapacityandnetworkflexibilityIncreasedunittrainterminalsallowformoreeffectiveandefficientshipmentstobetterservecustomersDiversified,StrongLogisticstoMeetDemandsAcrossNorthAmericaAnnualOil&GasTerminalThroughputCapacity(Mt)(1)HighlyComplementaryLarge-ScaleTerminalNetworkProppantRailandTruckingCapacityAccessToMajorRailLines–EnhancesFlexibility,DiversityandCostEfficienciesRegional(Trucking)Regional(Trucking)Regional(Trucking)Uniminfiguresincludeownedandexclusivelycontrolledterminalsaswellasexpansionscurrentlyunderway,butexclude3rdpartyterminalsutilized

CompellingProFormaInvestmentThesisSection4

BalancedindustrialmineralsandproppantsproductionwithdiverseofferingsandcustomersegmentsdrivingprofitabilityDiversifiedgeographicalexposurewithmorethan10%ofproformarevenuecomingfromoutsidetheUnitedStatesDiversifiedandBalancedPortfolioProFormaVolume;Mt,LTM(9/30/2017)TotalProFormaGrossProfit(1)(2);$M,LTM(9/30/2017)SalesVolumesProfitabilityFairmountfinancialspreparedunderUS-GAAP;UniminfinancialspreparedunderIFRSGrossprofitpreviouslyshownas$559MintheDec.2017presentation,increaseingrossprofitreflectsareclassificationofcoststoSG&AinUnimin’sfinancialsIndustrialMaterialsProppantSolutions$573M79%21%54%46%58%42%

ProductBreadthtoWinAcrossSegmentsBroadProductPortfolioWideRangeofCustomerSegmentsGlassConstruction&BuildingProductsCeramicsCoatings&PolymersMetals&CastingsFiltrationOil&GasHigh-PuritySandsHighqualitypuresilicasandsupplyingO&GandindustrialcustomersCustomBlendingExpertcustomblendsofsand,aggregates,minerals,colorantsandothermaterialsDustShieldChemicalsolutionthatwilllowertheamountofrespirablecrystallinesilicaandreduceoreliminatetheneedforcostlyengineeringcontrolsPropelSSP®Increasesreservoirrecoverybyoptimizingwellgeometry&operationalefficienciesResin-CoatedProductsHigh-performanceresinsystemsandadvancedresincoatedproductsforenergyandindustrialcustomersegmentsSilica-freematerialthatimprovesabrasion&weatheringresistanceinpaints+actsasfluxinglass&ceramicsproductionNephelineSyeniteSports&Recreation

ComplementaryFootprintAcrossNorthAmericaPlantsPlantsTerminals(1)Terminals(1)ExcludescoatingoperationsinDenmark&ChinaIncludesO&GandIndustrialNote:Locationsrepresentedasaccuratelyaspossible,indicativeonlyCombinedfootprintofmorethan50sand&coatingplantsacrossNorthAmerica(1)Accesstoallmajorrailwaysservingmajoroil&gasbasinsExpandedterminalnetworkwith96terminalsacrossUSandCanada(2)WellpositionedIndustrialbusinessingrowingSoutheasternUSandMexicanmarketsMexicoCanada

StableIndustrialBasewithEnergyPoisedforGrowthAdjustedEBITDA(1)FairmountAdj.EBITDAasdisclosedinSECfilings,UniminfinancialspreparedunderIFRSwithAdjustedEBITDAdevelopedconsistentwithFairmountmethodologyforcomparabilitypurposes$M

ProFormaCapitalization–SupportedbyaStrong&FlexibleBalanceSheetProformafortherefinancingcompletedon1November2017ProformaforillustrativetransactionexpensesFairmountfinancialspreparedunderUS-GAAP;UniminfinancialspreparedunderIFRSwithAdj.EBITDAdevelopedconsistentwithFairmountmethodologyforcomparabilitypurposes;assumesexpectedrun-ratesynergiesofapproximately$150MNote:SmalldifferencesduetoroundingMoody’s:“MergerwithUniminisCreditPositive”“Thecombinationiscreditpositivebecausethemergedentitywillbenefitfrombroaderscale;alarge,comprehensivelogisticsnetwork;diversificationintermsofproductandgeography;andamorebalancedprofitstreamastheproppantssegmentrepresents60%ofgrossprofitandtheindustrialsegmentrepresents40%,proformaforthe12monthsendedSeptember30,2017.Inaddition,theindustrialsegmentgeneratesmorepredictableearningsstreamwhichwillhelpthenewentitytoweatherthevolatilityinoilandnaturalgasendmarkets”PositiveReceptionbyCreditRatingAgenciesS&P:“FairmountSantrolInc.RatingsPlacedOnWatchPositiveOnPlannedMergerWithUniminCorp.”“Webelievethenewentitywillhaveabettercreditprofilethanthestand-alonebusinessofFairmountSantrol.Inaddition,thecombinedcompanywillbelarger,offeringmoreproductsacrossmorediversifiedendmarketsandoperatingacrossalargergeographicfootprintinmorecountries.”$BnNetDebt(1)(2)0.60.81.5SelectCreditMetricsNetDebt/LTMAdj.EBITDA+run-ratesynergies(3)2.8x3.4x3.9xNetDebt/LTMAdj.EBITDA(3)4.0xProFormaBalanceSheet(AsofSeptember30,2017)

IndustryDefiningTransactionBenefitingAllStakeholdersSUPPLIERSIncreasedsupplychainefficiencyDistributionnetworkincreasesthroughputcapacityandprovidessupplierflexibilityCUSTOMERSEnhancedlogistical&operationalflexibilitytobetterserveourcustomersEnlargedplantfootprintbringsusclosertoourcustomersImprovedaccesstocapitaltogrowwithourcustomersGreaterproductbreadthanddevelopmentcapabilitiesEMPLOYEESImprovedstabilityinvolatileenvironmentGreateropportunitieswithinaleadingproppantandindustrialmaterialssolutionsproviderSHAREHOLDERSSignificantvaluecreationfromsubstantialsynergiesStrongcashflowgenerationdrivingflexibilityincapitalallocationHighermultipleawardedforresilientandgrowingindustrialbusiness$170McashconsiderationtoexistingshareholdersuponclosingofthetransactionDEBTHOLDERSImprovedleveragepositionEnhancedcashflowgenerationthrough-the-cyclefromsynergiesandresilientindustrialbusiness

RoadmaptoCompletionRegulatoryapprovalsandcustomaryclosingconditionsApprovalbyFairmountSantrolshareholdersShareholdersrepresenting26%haveenteredintovotingagreements(1)Expectedtoclosearoundmid2018PubliclistingofcombinedcompanyonNYSEconcurrentwithclosingAsofCOB12/8/2017(measurementdateinthemergeragreement)

AppendixUniminSelectedAssets

Unimin’sIndustrialBusiness–GlassandCeramicsCeramicsGlassOverviewActiveincontainer,floatandfiberglassmarketsStrongcashflowgeneratorforUniminGrowthdrivenbynicheapplicationsandgeographiesLongtermcontractualpositionsunderpinperformanceOverviewUShousingconstructionmaindriverforproductiongrowthinbothUSandMexicoinbothsanitaryandtileapplicationsDesigntrendsfavoringceramictilesinhomesUnimin’slowcostproduction,geographicalproximity,breadthofportfolioandtechnicalcapabilitiesaredifferentiatedattributesSelectedAssetsSelectedAssetsStateBulkLoadingRailroadPlantCoahuila,MexicoTruckN/ACanoitas(Silica)Veracruz,MexicoTruckandRailFerrosurJáltipan(Silica)StateBulkLoadingRailroadPlantTexasTruckandRailUnionPacificTroup(BallClay)Puebla,MexicoTruckN/AAhuazo-tepec(Feldspar)

Architecturalcoatingssalesenjoysrelativelysteadygrowthdrivenbyhousingstarts,DIYandindustryconsolidationMineralportfolioincludesnephelinesyenite,microcrystallinesilica,silicaandkaolinNephelinesyenite,isanichefillerindecorativepaintsanditsuseisincreasingduetoseveralgrowthdrivers:Superiorperformanceimprovementvs.carbonatesinpaintDynamichousingmarketcomprisingnewhomestartsandasizeablehomeimprovementmarketfueledbyhigherhomeequityCustomerconsolidationDevelopmentofnewMinex®gradesthatprovidefunctionalityinnewapplicationsPlasticsgrowthtargetingfood-basedapplicationswilldriveadditionalgrowthUnimin’sIndustrialBusiness–Coatings&PolymersCoatings&PolymersOverviewSelectedAssetsSelectedAssetsStateBulkLoadingRailroadPlantIllinoisTruckandRailTrucktoCanadianNationalandUnionPacificTamms(Nepheline)IllinoisTruckandRailUnionPacificTroyGrove(Nepheline)StateBulkLoadingRailroadPlantIllinoisTruckN/AElco(MicrocrystallineSilica)Ontario,CanadaTruckandRailCanadianPacificNSO(Nepheline)

Multi-mineralportfolioincludingsilica,lime,clays,kaolinandfeldsparsApplicationsincludemortars,grouts,carpetandroofbackingandothercementingapplicationsAssetswell-positionedingrowinggeographiesUnimin’sIndustrialBusiness–ConstructionConstructionOverviewSelectedAssetsSelectedAssetsStateBulkLoadingRailroadPlantGeorgiaTruckandRailCSXJunctionCity(Silica)StateBulkLoadingRailroadPlantNorthCarolinaTruckandRailCSXMarston(Silica)AlabamaTruckandRailCSX,NSCalera(Lime)NewJerseyTruckandRailW&WtoCSXandNSDividingCreek(Silica)VirginiaTruckandRailW&WtoCSXandNSGore(Silica)IdahoTruckandRailUnionPacificEmmett(Silica)

Unimin’sEnergyBusiness–SelectedKeyAssetsTerminalNewTownOdessa(FourTerminals)PondCreekBenwoodBulkLoadingTruckOnlyTruckandRailTruckandRailTruckOnlyTruckandRailRailRailroadTruckOnlyMNA(Missouri&NorthernArkansas)shortlinetotheUPBSNFRailroadTruckOnlyCanadianPacificUnionPacificPlantVoca,TexasGuion,ArkansasOregon,IllinoisCleburne,TexasTunnelCity,WisconsinKasotaJerryRunShalePlayBakkenPermianMidConMarcellusMarcellusRailRoadCanadianPacificUnionPacificUnionPacificCSXCSXNorthernWhiteandRegionalSandAssetsTerminalsTruck,RailBSNFRailroadRoff,OklahomaTruck,Rail&BargeCSX(DirectandUnitTrainCapabilities),UP,BNSFNorfolkSouthern(indirect)Utica,Illinois