of sampling and testwork required. A simple, nearsurface, freemilling gold ore may require only a small amount of sampling and testwork. A complex base metals sulphide deposit will dictate a much more detailed sampling and testwork program due to the increased technical complexity and risk associated with the plant design.
Stoper mining is still the most economical method to mine a narrow vein of gold, even though much research has been made on equipment to do this type of mining. Using a Eimco 12B mucker, in a 5 foot wide by 7 foot high tunnel, approximately 5 tons per 8 hour shift per man can be achieved, stoper mining.