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Show MUBCOS E. JONES j 01 G1IQTIIE ORES i i Well-known Salt Lake Man I Visits Fields Near Green River. Marcus E. Jones of Salt Lake, geologist 5 and botanist, returned Thursday from a E prospecting trip in the vicinity of South ? Temple wash, where in company with jj A. L. Lewis and Robert Woodruff, C. E., t lie located some promising mineral claims, says the Green River Dispatch. It will be remembered that the professor spent a ' month investigating the earnoUte field in j the vicinity 01 Moab last year. He carries car-ries with him a standard electroscope I and complete outfit for testing ores. Last year when the processor studied ' the Moab field he found uranium de- j posits In Jurassic formation, seemingly having its origin in the purple bed im- j mediately joining the sandstone in which the ore is deposited, sandstones simply , being receptacles of solutions coming out ' of the clay beds. On the subject of ore deposits he says: Kor that reason th deposits are pockety, because of infiltration from adjoini ng clays. There are two or possibly three horizons, or sj stems of layers, in which ores occur. Of course these are called veins, but there is no such thing as a uranium vein in Utah. The ores go through sandstones in little stringers a nd have soaked out in sandstone, staining more or less uranium, so that deposits run from a trace to i and 10 and very rarely 2o per cent uranium oxide. It Is quite difficult to mine tiie ore and sort in such a way that it will go above 2 per cent. t In mining, therefore, lots of low-grade, low-grade, 1 per cent or less, must be 1 neglected, bur not near so much as i most people suppose. The mam question ques-tion to consider now is whether the ore occurs in sandstone in sufficient quantities to pay to extract. Heca use of the pockety nature of deposits men now- mining who-aie not experienced simply take all t i,e ore in sight, announce that the claim is worked out and abandon tiie workings. work-ings. As to I'tah deposits, those in the vicinity of Green River are in two independent lines of mineralization. The ones thnl have been worked, up to tiie present time, including the. Cameron group, Piiaw claims and thoe along the San Rafael reef, are all In sandstone immediately over-King over-King purple shales wnlch wro closely above gypsum beds in upper Jurassic formation. These extend for long distances. from TV ood side to the Henry mountains, along formations from thp Green river to Court House wash and along flanks of the La Sal mountains to Paradox valley in Colorado. Colo-rado. Those reda Hp nearly horizontal, dipping eat or according to the pitch, and are very extensive. Tiie deposits themselves are vcj-v narrow and require re-quire ele handling to make pay. Moft of the ore in deposits runs below '2 pr cent grade. The second line of mineralization, hih in a areat surprie to geologists, geolo-gists, lies either in Tria'-sio or verv lowest beds of Jurassb", from PWi to -"tOO feet below other deposits, hut they, like other deposits, lie in sand- ctnna rtr m n "! nrnpn t p n Yin v nn nil p beds. These are found in the rather Rteenly pitcldng beds in the San Rafael swell and are most pronounced in South Temple wash, where the Swa- j spy-Bryan claims are located. Thin ore goes about 2 per ten t uranium nvpje, and thi claims produce a considerable con-siderable quantity of 2. per cent ore. I have traced deposits for a distance, dis-tance, of thirty or forty miles, but. the part containing unmistakable evidence evi-dence of uranium does not extend farther than ten to fifteen miles, although al-though I think this is hecnuse of lack of development. Instead of lack of deposit. |