| Show POINTERS FOR prospectors D L blake considerable guesswork can be taken out of prospecting prospect mg if the pros knows which rock strata are most favorable far for uranium juirl minera libation liza tion and how to locate those formations however there do not seem to be infallible geological ecological guides since uranium has been found in all three types of rock igneous sedimentary and metamorphic igneous rocks have hae been formed by the solidification of molten mater bials such as lava there are two types of igneous rock if the molten material reached the surface of the earth before hardening it is called extrusive orr volcanic rock this kind is usually very fine grained in texture and may appear to be glassy and glossy an it is usually usually dark colored sedimentary rocks are composed of bits of older weathered and worn rocks that have been deposited us bally in beds or layers these particles of old rock have become cemented into a solid mass through pressure or the action of chemicals and liquids sedimentary rock there fore vary greatly in both color and texture shale limestone sandstone and conglomerate rock are examples of sedimentary rock on the colo rado plateau uranium deposits are usual lly found in sedimentary rock metamorphic rocks have been changed from their original form by great pressure heat or gasses into something very different from what hat they were ere in their original state metamorphic rocks were once either sedimentary igneous or both of tass types allate and marble are of those these types slate and marble are aro As mentioned before the sediment tary rocks were laid down in beds or layers and these formations are easily distinguished from each other by color texture thickness position and etc the different strata of rock were formed at tain periods of time in geologic history our next column will show a geologic map of tha the various roc strata which you will want tol to memorize I 1 there are several different types J f d deposits posits in which uranium is fourd following are their names and brief the richest kind of ore is frequently found in vein deposits veins are cracks in the host rock which have been filled with bation veins may b be found hi ill any type of reek but pitchblende is not usually found on the colorado plateau placer type of 0 deposits are found irl the sand and find gravel of streams such as gol gold and silver which can be recovered by pan ning uranium is not found in quantity in this maner pegmatite deposits which have large crystals are associated with rocks only 0 n 1 y small S m all amounts of primary uranium are found here this brings us to the last two types of deposits de sits sedimentary and cop per uranium deposits these are the two u anpo apo tart types of uranium that are found on the colorado plateau plata thee u two types of uranium 0 e will be discussed in detail next week when the geologic map will also be presented until then happy hun ting |
