FMR Investments

Mining Operations – Eloise Copper Mine & Gordon Sirdar

Eloise Copper Mine

History

The Eloise deposit was discovered by BHP in 1987. The deposit was then acquired by Amalg Resources from BHP in 1995. The portal was commenced in 1995 with the first ore mined in April 1996. In February 2003 Amalg Resources merged with Breakaway Resources to form the new company Breakaway Resources Limited. In May 2004 Barminco Pty Ltd (now FMR Investments Pty Ltd) purchased the mine from Breakaway Resources and operated the mine and mill until it was placed under a care and maintenance program in November 2008 owing to the fall in commodity prices. Mining operation recommenced early 2011. The mine is currently operational.

Geology & Mining

The Eloise copper deposit primarily comprises two mineralised corridors designated Eastern Load System and Western Load System 150m apart. They strike north-south and dip steeply to the east. The two ore zones occur over a strike length of about 650m and have been drilled to depths in excess of 1,600m.

Since inception at the end of each year the mine has always had approximately 2 million tonnes grading 3% copper (23 years mine life). A major exploration program, which started early 2017, utilising two underground rigs and one surface rig has increased resources to a 5 year mine life. Significantly 30% of these resources are in the upper levels of the mine. Allowing shorter haulage distances and cooler operation conditions. This relieves production pressure in the deeper mining areas.

The mine is accessed via a 5.0m x 5.5m, 1:7 decline. Mine levels are typically established at 25m vertical spacing. The underground workings are ventilated via two downcast shafts and one primary exhaust shaft. Until 2008 Open Longhole Stoping was utilised to mine the deposit. On reopening a Longitudinal Sub Level Caving Method has been applied.

Eloise is located in an area of high geothermal gradient with ground temperature of 55°C in the deeper parts of the mine. To enable mining to continue, intake air passes through a Chiller Plant located on the surface before transferring underground via two downcast shafts. Second Chiller Plant half way down the mine was installed in 2017.

Processing

Eloise Copper Mine operates a conventional floatation circuit to produce a high grade copper concentrate with gold and silver credits. The mill is capable of sustaining a rate of 600,000 tonnes per annum. The plant operates a two stage crushing facility capable of producing a 16mm product at 100-120 tph. This is comprised of a primary jaw crusher and apron feeder operating in closed circuit with a secondary cone crusher.

Communition is via a two stage crushing circuit grinding to a typical p80 of 75 micron. The floatation circuit comprises rougher and scavenger floatation cells and a bank of cleaner and recleaner cells.

Thickening and filtration is handled via a 9.0m diameter Larox Supaflo thickener with the underflow running at 65 to 80 % solids. The underflow goes to 1.8m diameter American disc filters producing filter cake with moisture content of about 13%. The concentrate is sun dried to about 8 to 9% moisture content ready for transport and shipment.

Gordon Sirdar

The Gordon Sirdar Project comprises tenements located within the North East Coolgardie mineral field 55kms north-east of Kalgoorlie-Boulder.

The mine sequence comprises unmineralised porphyry to the east. Gold mineralisation is associated with a highly silicified carbonated, fuchsitic and pyritic lode system within the Gordon shear zone. From west to east four parallel minerilised occur, designated Gordons, Milla, Leslie and Isbella. They strike north-west and dip steeply to the west. Widths vary from 3m to 15m.

Production history is tabled below.

  Years   Works   Depth to
(Surface at 1360)
  Tonnes   Grade   Ozs
1899 – 1929
1936 – 1950
Underground & Minor Open Pit 1325 52,200 11.3 19,200
1999 Trial Open Pit 1290 81,000 6.0 15,900
2000 Deeping Pit 1280 12,300 8.1 3,200
2010 – 2011 Pit Cut-Back 1260 218,600 2.7 19,200
2012 – 2013 Underground 1140 91,500 3.8 11,300
2016 – 2017 Underground 990 302,500 2.0 19,600
  Total       758,100   3.6   88,400

Current underground mining is a year to year proposition as underground exploration grade control diamond drilling is only ever 3 to 6 months ahead of production.

Ore is carted to the FMR Greenfields Mill at Coolgardie.
Suite 11,
2 Hardy Street,
South Perth
Western Australia 6151
Australia
Locked Bag 6,
South Perth
Western Australia 6951
Australia