Bayhorse Silver Mine
The Bayhorse Silver Mine is currently in the process of drilling into and establishing the Big Dog stope for future feed to the mill. The mineralization has shown grades of up to 54 oz/t ((1,680 g/t) silver content.
At the Mill, we grind it to between 100 mesh (150 microns) to 200 mesh (80 microns) that has been determined by the metallurgical work we have done in conjunction with Metsolve Labs, Langley, BC, to give best mineral recovery through flotation.
We then pass the grind through a “Cyclone” that separates oversize for regrinding from the preferred grind size.
This material is then “conditioned” with various small amounts of reagents (typically no more than 110 grams per tonne in total) before it goes into the “float cells”. There it is vigorously agitated to create a froth, that contains the minerals, that we scrape of in two stages, called roughing and cleaning, (the “Con”) off the top, and send the demineralized “tails” and process water to be recycled.
We test the “Con” and “Tails” and the process water for mineral content to ensure it passes Idaho DEQ requirements for disposal.
We dewater the “Con” and finally bag it in 1 tonne super sacks.
As the mill feed varies in grade, so do to the “Cons” vary in grade, so we must ensure that we keep as constant a silver grade as possible for when we ship. We can do this in two or three ways. One way is to thoroughly blend the “Con” before bagging so we can assure ourselves that each bag of “Con” is consistent in grade.
As we are going to be shipping in 20 tonne container loads, there will be 20 bags of concentrate. When we ship, we assay each bag, and provide that assay to the purchaser. This is an extremely important part of the process. We want to ensure we have an accurate accounting of what we are shipping, for our protection, and the purchaser will do their own assays of received shipments , for their protection, to make sure they are getting what they pay for. Any final payments on shipments is subject to the assays agreeing with each other.
Pressure Filter control panel with Vacuum Filter Unit in the foreground.