Show SUCCESS AT THE LINCOLN statesman boise idaho david kennedy manager of the lincoln mine at pearl has returned after an absence of some time superintendent george Z edwards is also in the city they brought in a cleanup clean up from the property to be deposited in the united states assay office it is stated the work that has been in progress for some time in getting at the right method of cyaniding cyan iding the second class concentrates has borne good fruit they now believe they have the process down to such a point that they need no longer experiment the ore is run over plates on which 20 per ce cent nt of the values are recovered it then passes to tables for concentration the fhe concentrates are separated into two lasses classes one carrying the lead and zinc N ith th high gold values in these high grade concentrates about 10 per cent of the value ot of the ore is recovered the second grade concentrates are reground to about mesh and cyanided the e grinding is ig in the solution they at first had a system of tanks in which the solution and pulp were agitated after grinding but this did not prove satisfactory becoming convinced that grinding in solution would afford all the aeration necessary they adopted the plan of running the reground charge directly into a settling tank with a false bottom there are many of these each holding about a ton the amount reground at each charge in each mill in this small tank the solution is drawn off both by filtration and by decanting in this manner about 55 per cent of the values of the ore is obtained making a ectal approximating 85 per cent the remainder is left in the concentrates these showing a value of 12 a ton after treatment they are dumped in the air where they will be left to oxidize the gold remaining being in the iron which is so compact that the solution cannot penetrate all the particles the mine is looking remarkably well mr edwards says moreover the ore is maintaining a good grade he states it carrios carries from 6 to 9 a ton after having gone over the plates while mr kennedy is here plans will be shaped for sinking the shaft feet deeper and opening up a fourth level |