Show 1 ar A e C J W 0 0 0 0 N r as onez AIR 4 I 1 rl V 74 a x avow 0 ja A C id HE cactus ore is a porphyry the mineral contents being present as pyrites of iron and copper the gangue is extremely soft and slimy as the following screen analysis will show ore all crushed to pass 7 16 1 pass inch Reta retained inen on mesh 3 6 10 20 30 5 50 0 i dla dia in in inches wb 27 14 ai 1 0 1 00 z per percent cent 21 2122 22 1875 18 75 1 1862 75 90 80 6 60 0 in crushing the same sample through a i inch hole as much as 10 per cent passed a edoo mesh screen i 1 it was impossible at first to make clean I 1 mineral on the coarser siz esthe sizes the jigs acting as 69 crushing machines on this soft material the disinter grated particles and slimes falling into the hutches and spoiling the work of the jig ape difficulty was overcome by discharging char gink the concentrates from above the jig screens instead of through them and then re tip eating the hutch product on the finer jigs jiga and nd mac bines be below low as indicated in the diagram gram andl A spi sp cial and nov novel e 1 feature of the plant is the use f shaki shak irig screens for everything below five mesh a and d the screen sizing of the product for the wilfley tables instead of water waters s zing c 1 this Is s an in innovation ovation in ore concentration ail abid d pro P ro aises ise very w well e 11 increasing both the I 1 13 capacity of the tables and the extraction and leading to a great economy of water the machine is a late invention of the writer the sizes of screen cloth used are shown on the diagram and the experience gained so far would indicate that there will be no diffie culty in screening down to as small as mesh 3 1000 inch the machines are simple require little attention or mill space and and although it is too early yet to give any iery very accurate figures it has been found that each square foot of 20 mesh screen cloth has aa aca lacity of about three tons per day i the above diagram of the travel of the ore through the mill will be self e explanatory |