|
overlying quartzite, evidently having as its source a fissure in the interior of the range in which it lies. It varies is
<br />thielmeas from one to-five. feet trod dips to the southwest. at s•n .angle of two; degrees to six .degrees, having the physical
<br />character of-a`bed of- coal; rendering the mining an-easy problem.
<br />THE MILL
<br />is situated on the side-hill, the top-floor beiugabout ninety feet below the ore body at this point. Ore from the mine will
<br />be trammed to'ore` bins o$ 250 tons capacity, now nearing completion, whence it will be trammed ag required to the mill,
<br />passed over a grizzly and through a lOs7 Blake Crusher. to the battery bins, from which it will be fed by two Challenge
<br />Antomatic'Feedeis to-the battery of ten. 850-pound stamps dropping ninety-five times per minute and discharged upon
<br />si]ver-plated`coppieiamalgamatingplates twelve feet in length. -
<br />The pulp;"from which `the free gold will have been extracted, will flow to a large classifier, over two Cammett Con-
<br />centrating'Taliles; through a large'4-shaped settler, and ever t,.o four-foot, smooth-belt Frue Vanners, situated on the
<br />lowest, or fourth level, surplus water frcm the settler being pumped back to the storage tanks and tailings flowing through
<br />sluices to ponds`foimed by a plank dam 300 yards below, ne ar the site of the proposed cyanide plant. With this system
<br />of amalgamation and concentration, each machine working upon a separate size of pulp, such a des •ee of efficiency should
<br />6e obtained as to leave little value in the tailings.
<br />POWEII
<br />for the mill will be furnished' by a 50=H. P. horizontal flue-boiler and a 10x14 Taylor Slide-valve Steam Engine. The
<br />power for all machinery outside the mill will. be -electric; transmitted from x.121/ -Ti. W. 125-volt D. C. Triumph dynamo,
<br />operated' by%a 22=H. ,Pi Webber Gasoline Engine and situated iu a special room in the mill, adjacent to the boiler room.
<br />These machines will eirpply lights-for 'the mines and buildings; and power for half a dozen Durkee Lightning Drills, ven-
<br />tilating blower, laboratory machinery, and pump, leaving an excess of several horse-power for any small machinery which
<br />may be installed in the future.
<br />CYANIDE PLANT.
<br />From the 750. tons of ore which was put through a small steam stamp-mill situated on the back of )tlancos, below
<br />,,,,, :.:.aa:,,,... +r, ,: ..,.,, ~: ,....,aoa ~o:.,,,,+'Knn i~n~ ~f +n;7;r ~~ Them hnce lieen. thoi•ounhly tested and assayed and the
<br />lowest returns have showed a,.dglue of $20.40; and tests with cyanide solution gnvei an extraction of 49 per cent. before
<br />roastiag and 95 per cent. after roasting. We cannot, of course, count upon so complete nn extraction as was made in the
<br />laboratory, but we may assume an ectrnetion of SO per cent. as a safe figure.
<br />The cost of treatment ie difficult to estimate closely as it is a very variable and delusive factor. It may vary from
<br />$2.50 to $3.50 per ton, including cost of roasting, treating sixty tons of tailings per day. A fair estimate would probably
<br />he $3.00, but, assmning the maximum estimate of $3.50 for calculation, and an extraction of 30 per teat. of the lowest as-
<br />eayvalue, or $16.32, we have a profit of $12.82 per ton, or a t otal of $9,015, more than sufficient to pay the building and
<br />equipment of the plant, leaving it unencumbered for the tree tment of ore from the mines or• tailings from the new mill.
<br />We know that at least one of the group of mines contains, iu paying quantities, ore which is amenable to cyanide
<br />treatment and this will be worked by that process; and it is not unlikely that we may find it economical to treat the tail-
<br />ings from the mill also. The mill will have n enpacity of twenty-five to thirty tons daily. The cyanide plant we intend
<br />to make of sixty tons enpacity and operate half the year, as during the winter mouths there is hardly sufficient water.
<br />WATER SUPPLY.
<br />During six or seven months of the year, water for the mill and buildings will be derived from Gold River, a
<br />siream of remarkable purity, emanating frorn a Inks half a m ile above the mill and at nn elevation 350 feet to 400 feet
<br />
|