Troy Mine

 

Status: Placed on Care and Maintenace January 2015
Location: Lincoln Co., Montana, USA 
Ownership: 100% by Revett Mining Company, Inc.
Project Type: Underground Room & Pillar Mine / Conventional Flotation Processing 
Products: Silver & Copper Concentrates
Commodities: Silver / Copper (40% Ag / 60% Cu by value)
Reserves (P&P): 11.07 million tons @ 1.01 opt Ag & 0.39% Cu 
Historic Production Rate: 4,000 tons per day 
1.0 million oz Silver per annum (avg. at planned production)
8.0 million pounds Copper per annum

The Troy ore body was discovered by Bear Creek Mining (Kennecott) in the early 1960's, and was later optioned to ASARCO to develop and operate. Asarco operated the Troy Mine from 1980 until early 1993.  The mine plan was based on mining the thick middle quartzite ore zone which, coupled with shorter haulage routes to the crusher, enabled a production rate of 8,000 tons per day (tpd). After mining the majority of the middle quartzite ore zone and a significant decline in metal prices, ASARCO shut down the mine and placed it on care-and-maintenance with the intent of reopening once economics warranted. Revett acquired the property in 1999.

Late in 2003 as metals prices began to improve Revett made the decision to go back into production. Hiring and rehabilitation commenced in May 2004 with first concentrate being produced in December 2004.  Since resuming production in late 2004, the Troy Mine has produced 8.4M ounces of silver and 69.5M pounds of copper. In December 2012, the Company suspended operations due to unstable ground conditions.  Revett recently initiated an orderly wind down of operations to place the Troy Mine on Care and Maintenace with hopes to resume production when silver and copper prices improve.