Mine Tonnage: 136 077 t per year (150 000 short tons per year) at 0.25 oz/t of gold and 0.05 oz/t of silver.
Diamond Hill is currently on a standby basis and is fully permitted to allow resumption of production. A diamond drill exploration program to extend the reserve base was started in June 2002 is currently underway. Return of the mine to production will depend upon the price of gold and success in finding additional ore through the current exploration effort.
Mine Tonnage in 2000:
12 247 t/month (13500 short tons/month) at a grade of 21 oz/t in silver, for a total of 3 850 000 oz/year. In 2001, Silver production was 4 507 652 ounces.
The Galena facility began mining around 1955 and by the late 1970s had become first in silver output in the United States. The mine has historically processed from 163,290 to 181,440 metric tons (180,000 to 200,000 short tons) per year of ore providing approximately 4 million troy ounces of silver, 3 million pounds of copper concentrate, and 7 million pounds of lead. Maximum mill production at Galena is approximately 1115 metric tons per day (1230 tons/day). The average mill production rates for Galena are 725 metric tons per day (800 short tons/day).
Daily production: 708 t per day (780 short tons per day) at 0.196 oz/t.
Annual production: 217 724 tons (240 000 short tons).
The reserves for the years to come are in the K-2 East zone.
Production for 2001 was 30 000 metric tons of ore and 45 000 metric tons of waste per month. When shaft 4 will be in production, employment stock will attain 4000 and production will increase up to 155 000 metric tons per month.
Usually, ore grade varies between 12 and 13 grams per metric ton.
Underground production accounts for 350 000 tonnes per year. This tonnage is sourced from three mines: Centenary, Strzelecki and Barkers.
Refer to attached document.
Mine tonnage: 2000 to 2180 tons/day (2200 to 2400 short tons/day).
Average grade: 0.22 oz/short ton of gold.
One half of the production comes from mechanized cut-and-fill stopes and the other half comes from long-hole open stopes.
Diluted reserves: 6 726 000 t @ 5.45 g/t.
Diluted reserves: 185 244 t @ 8.26 g/t.
Annual production: 15 million tons of ore annually, yielding 1.9 million ounces of platinum group metals (PGM) including over one million ounces of Platinum. Impala is able to maintain production levels at a minimum of one million ounces of platinum for the next 30 years.
PGM: The platinum group elements, platinum, palladium, rhodium, ruthenium, osmium and iridium, are group VIIIA transition elements with strong siderophile and chalcophile characters.
Narrow vein zones: 15 000 tons per month at a grade of 8.08 g/t.
Underground Mine Tonnage: 600 000 tonnes per year.
The tonnage will increase up to 1 000 000 tonnes per year once the open pit will close.
Mine Tonnage and grade:
38 000 tons/month (41888 short tons/month).
Narrow vein zones - Tonnage and grade:
8000 tons/month (8818 short tons/month) @ 12 g/t.
Mine Tonnage and grade: 180 000 t at 7.00 g/t (40 500 oz).
Annual development: 2.5 km (1.55 miles) of ore drift and 1.2 km (0.75 mile) of waste drift.
The annual tonnage was of 600 000 tons/year for four years. For the year 2000, it was reduced to 500 000 tons. Since the reserves are located in a narrow zone, the tonnage for the future will be of 100 000 tons/year.
1 700 000 tons/year from sub-level caving.
120 000 tons/year at 3% Nickel scheduled for zone 1A. The 1A orebody has an average of 3000 tons per vertical metre. The scheduled annual rate of 120000 tons per year lies within the trend of other narrow orebodies.
Mining Reserve of February 2000:
742 600 t @ 3.9% Nickel for 29 200 t of Nickel in situ. Ore reserves are compiled using a Datamine model. The following parameters and assumptions were used:
- Minimum stoping width: 2.1 m (7 ft).
- Footwall dilution: 0.2 m (0.65 ft).
- Hanging wall dilution: 0.5 m (1.64 ft) where the stope is less than 2.1 m (7 ft).
- Additional dilution: An allowance of 5% is added for mucking off the fill floors. To take into account dilution when mucking against the backfill, it is assumed that 40% of the tonnes from the first ring is fill and 20% from the second ring is fill.
- Stope height: 13.0 m (42.6 ft).
- Ore/sill drives: Minimum dimensions of 3.0 m (10 ft) wide by 4.0 m (13 ft) high. Hanging wall side of the ore drives is carried on the ultramafic contact.
December 1999 reserve for Wannaway NO2 Lode: 297 504 ore tonnes @ 3.78% for 11 239 Nickel tonne. Reserves have been compiled using a Datamine model. The following parameters and assumptions were used to prepare the Ore reserve:
- Minimum stoping width: 3.0 m (10 ft).
- Footwall dilution: 0.2 m (0.65 ft) included in the stope width.
- Hanging wall dilution: 0.3 m (1 ft) additional to stope width.
- Additional dilution: An allowance of 5% is added for mucking off the fill floors. A 95% factor has been applied to the metal tonnes to allow for discontinuities within orebodies.
- Stope height: 3.3 m (10.8 ft) plus 1 m (3.3 ft) brow.
- Ore drives: Minimum dimensions of 3.3 m (10.8 ft) wide by 4.5 m (14.7 ft) high.
- Crown pillars: Two 3.3 m (10.8 ft) thick crown pillars have been identified for mine scheduling reasons. These are planned to be mined in replacement of the crown using cement fill.