Show 1 BUREAU OF MINES investigations i A tentative program has been drawn up by the bureau of mines to an investigation of explosives used in the metal mines of the southwest A study of the causes symptoms prevention and treat treaty ment of mercury poisoning has been made under the direction of the chief surgeon of the bureau of mines the alaska experiment station of the bureau of mines at fairbanks has made a study of the possibilities of working i in the large low grade gold bearing bench deposits along the seventy mile river by hydraulic methods using the ditch water results of tests on ontario ore samples from park city utah made at the intermountain station indicate that if all the small quantities of sulphide minerals contained in the so called oxidized ore can be removed a high grade recovery of the silver will be obtained in the study of the milling problems of the missouri kansas oklahoma lead and zinc district being conducted at the mississippi valley experiment station rolla mo experimental work has been done to ascertain if rougher jig tailings after being given a tumbling in a ball mill would not be more amenable tio to jigging jay 0 ino on a chat jig these tests indicated that ba ball I 1 milling would make possible a bailin tailing of per tent cent lower in in zinc zinc than otherwise this means that ball milling should increase profits mine operators in the tonopah To nevada district are having considerable trouble with drill steels as different lots received require different heat treatment in tempering at one mine the steel does not stand up in hard ground a when used in the with the outside water spray at two different times in one mine mine the drill bits after being used five or ten minutes were noted to be at red heat as drawn from the holes the problem is being studied by the bureau of mines in the course of its general investigation of drill steels an investigation has been made as to the effects of dust hi high 6 h temperatures and high 6 on the miners employed in the mines at tonopah To nevada A report of the results of similar investigations in the butte montana mines is is in in preparation an apparatus is being devised tor for the collection of samples of mine dust containing soluble lead in connection with the investigation of lead poisoning in the milling of lead carbonate in the mines of utah an investigation was recently made of the health hazards fron from lead in the manufacture of storage batteries by a california company in the course of flotation experiments being conducted by the moscow idaho field office of the bureau bureau of eliges M in operation cooperation co with the simon silver lead company aln nevada it has been found that hardwood creosote alone alo gave a fair differential separation of the galena and salia rite in combination with sodium dibasic di basic phosphate a marked flotation of the galena in preference to th the e sp a rite was given sodium carbonate and creosote gave be ater results tl than i an creosote alone the same being true of banate |