GBGM Inglewood Pty Ltd
The Maxwells Mine & Processing Plant
A Project Update Presentation
GBGM Inglewood Pty Ltd owns and operates the Maxwells Mine north of Inglewood.
The shaft is a conventional 3 compartment shaft and rail levels access a series of veins hosting
high grade gold within a major east dipping fault system.
Inglewood Project
Inglewood ProjectEL 4184
Inglewood ProjectMIN 4639
Inglewood ProjectMaxwell’s mine operations
Inglewood historically
• Difficult mining conditions for early miners(lack of water, dense vegetation)
Inglewood historically
• Difficult mining conditions for early miners(lack of water, dense vegetation)
• High grade outcropping reefs preferred
Inglewood historically
• Difficult mining conditions for early miners(lack of water, dense vegetation)
• High grade outcropping reefs preferred
• Only 4 mines ever developed below the water table
Inglewood historically
• Difficult mining conditions for early miners(lack of water, dense vegetation)
• High grade outcropping reefs preferred
• Only 4 mines ever developed below the water table
• Cut off grades in excess of 1 ounce during initial gold rush
Inglewood GoldfieldProduction summary
4 major minesTons
('000's)Oz
('000's)Kg
Gradeg/t
Maxwells 35.5 37,000 1,156 32.5
Jersey 16.1 21,000 656 40.6
Columbian 38.5 39,000 1,239 32.2
March Unity/ Morning Star 38.5 20,500 639 16.6
Total 128 118,400 3,691 28.7
Tons('000's)
Oz('000's)
KgGrade
g/t
4 major mines 128 118,394 3,691 28.7Composite of other shafts 37 30,207 200 5.3
165 148,601 3,891
* Preliminary research figures
Production
Total Inglewood production from all sources*
Inglewood Goldfield
• Past production of 130,000 ounces to ~200m depth
• 4 main areas produced 80% of the production
• Numerous Parallel Reef lines across the field
• Mining ceased in the 1920’s due to war and economics
• Goldquest N.L. re-evaluated the field in the 1980’s
• Goldquest reopened the Maxwell’s Mine and discovered a new shallow unworked ore shoot
• Production ceased due to poor economic conditions in 1994
Production summary
Inglewood’s potential
5 facts about Inglewood
• Goldfield extents similar to Bendigo
• Inglewood production: ~130,000 oz from predominantly shallow mining
• Approx. 100 known reef locations
• High grade reefs - 1 oz
• Remains largely unexplored by modern day capabilities
Exploration potential Linear extensions of Maxwell
Lower Maxwell
adjacent potential to Maxwell
extensions of the other known 40 reefs
New reefs (shallow)
Maxwell’s Mine
• Aerial view 2007
Operations
Maxwell’s MineOperations
Maxwell’s Mine
Max Shoot
Max North Shoot
Wolff Shoot
Maxwell’s Mine - ShaftLaidlaw's shaft
Underground 3D model
330 m BS
106 m BS
Maxwell’s MineUnderground
Composite Photo of Face at 7m North Sub level 1 Max shoot
Footwall faultHanging wall Fault
Maxwell’s MineUnderground
Max Shoot, north drive showingEast dipping quartz veining
Maxwell’s Mine
High Grade ore from the Max shoot
“The prize”
Maxwell’s Mine Processing Plant
Ore from underground is brought to surface and placed in a truck and dumped either in to the Feed Hopper or onto the Rom Pad
Maxwell’s Mine
Processing Plant feed conveyor and trommel arrangement
Operations
Maxwell’s MineOperations
Feed is scrubbed and screened at 19mmto remove all clays.
The Trommel undersizereports to the balance tankTo be pumped to the coarse gold trap.
Maxwell’s Mine
Trommel oversize (+19mm) is sent to a large granulator style jaw crusher to be crushed to approximately – 15mm which is returned to the balance tank to join the recovery circuit
Operations
Maxwell’s Mine
A grizzly atop the jaw crusher bypasses any oversize rocks to be stockpiled for later breaking
Operations
Maxwell’s Mine
An 8/6 Warman pump keeps the Ore circulating through the closed recovery circuit
Operations
Maxwell’s Mine
The -19 mm feed is Pumped across a Hydraulically active Sluice which removes the coarse gold
Operations
Maxwell’s Mine
Following coarse gold removal the feed material reports to a single deck shaking screen with a 1mm aperture size to prepare feed for the concentrators.
Operations
Maxwell’s MineOperations
Screen oversize is sent to an Impact Mill to reduce all the material to -1mm as well as “shape” the free gold to aid in gravity recovery
Maxwell’s Mine
The impact Mill in reducing all the material to -1mm has a considerable wear factor. GBM is trialling a series of different wear surfaces to reduce this factor.
An impact mill was chosen as it shapes the gold better for gravity recovery.
Operations
Maxwell’s Mine
All material in the main circuit is eventually reduced in size to -1mm and reports to the concentrator circuit via this pump
Operations
Maxwell’s Mine
The Concentrators are custom designed and heavily engineered to give highly balanced and controlled operation to optimize gravity recovery
Operations
Maxwell’s Mine
The Concentrator Feed is delivered to the concentrators via roses designed to present the feed at an optimal angle and rate
Operations
Maxwell’s Mine
The Concentrator tailings are sent to a hopper and then pumped to a cyclone to produce a sand product before delivery to the tailings storage facility
Operations
Maxwell’s Mine
Sluice concentrate (-2mm) removed by vacuum from the Sluice and shown here after screening.
This is tabled to produce a smeltable con.
The Impact Mill has shaped the gold to aid recovery
Operations
Maxwell’s Mine
Sluice con product +2mm after screening.Note this gold is effectively released after scrubbing and has not been through the crushing circuit.
It represents ~20% of recovered gold
Operations
Maxwell’s Mine
Concentrator Product.
Very fine gravity gold.
CIP leach circuit under design and construction program to boost recovery
Operations
Inglewood Goldfield
• Final product , Dore bar from a sample of ~50 tonnes.
• Final sample results awaited for reconciliation
Inglewood Goldfield
• 1000 Ha Mining Licence and 65 Sq Km E.L. covering the entire Inglewood Gold Field and including:
– Maxwell’s Mine in working order with access to ore resource areas
– Processing plant in commissioning / production
– GBGM Inglewood Pty Ltd owns outright all plant and equipment, including working head rig, Mine, Mill and 70ha freehold Land which is the site of the Evaporation Ponds and future tailings storage
– ~100,000 tonnes of tailings on the licence in immediate vicinity
– Extensive paper database of past historical workings and more recent exploration history
GBGM inventory
GBGM Inglewood Pty Ltd and its Maxwells Mine and Mill
are
All 100% owned by ASX listed Greater Bendigo Gold Mines Ltd
(Asx code GBM)
Thank you
www.gbgm.com.au
www.gbgm.com.au
COMPETENT PERSON STATEMENTThe information in this statement that relates to Exploration Results, Mineral Resources or Ore Reserves is based on information compiled by John Cahill, who is a Member the Australian Institute of Geoscientists.John Cahill is both Managing Director of Greater Bendigo Gold Mines Limited and a full time employee of GBGM Operations Ltd, the 100% owned operating subsidiary of Greater Bendigo Gold Mines Limited.John Cahill has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2004 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’. John Cahill consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.