Show owl THE GEOLOGY OF CITY rr tell E M J 7 in ahe daily Gri blane j i Cl boom there any boom on at park city at this time said robert bell mine inspector elect of idaho who has been for two weeks or more studying the geology of the great camp true he continued the camp is quite lively but the present spurt is only a gentle buzz of what the great dividend paying district is capable the geology of park city is comparatively sam simple ale and easily read consisting essentially of limestone quartzite and porphyry dykes this is apparently also true of the figure vein system but I 1 think the forthcoming report on the district by the united states geological survey will show a rather complicated system of faulting movements that have bodily shifted the whole series of strata hundreds of feet and will probably appear on the maps as a series of reverse step faults a mile or more apart and like the vein system following northeast and southwest lines with a pronounced to the north and west opposing the above another series of faults called dislocation fissures which are ore or ore e bea bearing fing run on the same lines and exhibit a decided of several hundred feet to the northwest and still another series of profound movements have cut the formations on north and south lines with a steep dip to the west the unraveling of these faulting systems is likely in time to afford some interesting commercial surprises questioned as to the future development and probable permanency of park city mines the visitor said that the wide distribution trib ution the varied and evident independent source of warrant the assumption that the resources of the district have not commenced to be appreciated of course you know it is impossible for one man to see an inch further into the solid rock than another the only true magnets for revealing hidden ore bodies are muscle powder and steel but the extensive underground development of the big mines at park paris city has revealed some valuable indicators dica tors that put a man in a position to make an intelligent guess at future results and the principal managers are commencing to have a comprehensive idea of their importance I 1 think I 1 could spot two or three new enterprises whose shares will be worth fully as much as the best in the district within eighteen months if present commercial conditions prevail for that length of time eighty per cent of the great production of park city mines at the present is coming from the contact deposits and amounts to 45 per cent of the total lead production of utah and ground along these contact lines is the most popular and most eagerly sought As an illustration of the vagaries of mineral deposition we have a lead producing district up in idaho which in full operation produces 45 per cent of the total lead production of the united states and the bulk of this phenomenal phenomena output is derived from big fissure veins in quartzite both walls from what I 1 learned the most potent ore sources at park city are the fissure veins and that the contact planes without the accompanying fissure sources to fertilize them will be entirely barren of ore and I 1 think it is not unlikely that the fissure veins of the camp will in the future as they have in the past yield fully an equal proportion of the pay mineral these great contact deposits however are likely to continue to be a very important source of profit as I 1 am of the opinion that all the contact ores of the camp are coming practically from one horizon along the ontario quartzite and below the daly west limestone and that the plane ol 01 this contact has been displaced by faulting the probable occurrence of lower contact ore bearing horizons underlying the ontario quartzite does not seem to have been half appreciated it is true that the lucky bill and parley park shafts each over a thousand feet deep were started for these formations but from the appearance of their great dumps neither of them proved anything for one is filled almost entirely with quartzite and the other with porphyry and very little crosscutting cross cutting seems to have been done the crosscut cross cut from the bottom of the wabash shaft feet deep exposes two great beds of limestone slightly on certain lines but fully ashure as pure in free lime carb carbonate onate as the lime beds ov overlying the ontario quartzite these deeper delepe r limestone beds are separated in the wabash mine by a bed of fine grained quartzite or highly rock resembling quartzite producing well defined free contacts and bedding planes that practically conform in strike and dip with the upper series this underlying limestone series inthe in the wabash mine below the ontario quartzite has been prone to contain high grade lead silver zinc and sulphide ores at great depth and theres ereis th no physical reason why these underlying der lying contacts should not have been fer utilized tili zed with great contact oie ore bodies along al the jq course bourqe of the strong fissure vein that tr traverses PLY them as was the upper lipper horizon 0 above bovet the lip ontario quartzite the wabash management m I 1 ys gradually unfolding what appears to be some new and important pages pages in the gp geological history of eark city d district is that tha in indicate d acate leadville file asat as at Lead v a succession of contact ore hor horizons mid and promise to multiply the ore producing possibilities of every acre of ground in the camp the ahe big mines of park city show some astonishing amounts of pay mineral the high values and glittering ore chambers of the silver king are the full realization of 0 all miners or capitalists dreams at the daly west superintendent kirby has to exercise a close watch of his crew to keep them from timbering up great fortunes of ore only the other day while watching a workman cutting a hitch for a st stull ulland and not being satisfied that the texture of the rock revealed the true foot wall he ordered a hole to be drilled in it with the result that by the next day a vein of solid sulphide ore was opened up four feet thick that is nearly half gray copper assaying very high values in silver this remarkable strike is ranging up toward the quincy works and with foreman harrington on the lower level of the quincy coming down toward it with a on an almost ide identical i body of ore and its continuity through between the two points although they are 1200 feet apart is practically guaranteed by a very pronounced line of feeding fissures shown at both ends the important bearing that this di disclosure sc losure is likely to have on the value of the property aside from its other great ore reserves can be appreciated adjoining the daly west the great daly judge mine is destined to rapidly climb to a place of eminence among the tha bonanzas of the camp in following the extensive underground der ground development of this mine under the guidance of superintendent I 1 f was shown twenty seven separate ore bodies ran ranging gi I 1 ng in almost a connected succession of big chutes for 2000 feet along the strike of the contact the most sensational feature of this property at the present time is the great disclose disclosure brein in their south dipping fissure vein where a body of high grade shipping mineral ten feet wide has just been opened up this discovery is half way over to bonanza flat and although opened at a face depth of about 1400 feet is still partly oxidized well sprinkled with copper minerals and remarkably fr free ee from zinc indicating a profound fissure and a probate probable great range of ore both up and down on the dip the blind veins and deep seated ore bodies of the P park ark city distri district bt will invariably involve an expensive plan of development before big ore bodies can be and anticipated ac pat this is a dem demonstrated fact as s shown hown by the history oi of the silver king the daly west the daly judge dge and the quincy whose first disclosures of profit profitable ore were made at depths ranging from to to 1 1200 f feet below the surface the re remarkably markall y profitable prizes these mines afforded however warranted the expensive outlay involved to reach them probably p what is s the largest connected ore body in the park city district ri I 1 ct at this date is exposed in the deepest levels of the dal west T thi 1 s shoot 0 ot of first his class milli milling fig ore ibb showed wed its h highest commercial afier c fal apex a few feet fe et ab above ov e the 1200 level where it appeared in three short fifie gers of ore not over aver twenty five feet above aboa the level after sinking on these short exposures of ore they rapidly expanded and grew together and at the 1500 foot level now form one connected ore body fully 1000 10 feet long and thirty feet thick and forms form the principal source of ore supply for the companas comp anys big mill with a reserve now in III sight that will take five years to work out at the present rate of production while 0 the comparatively shallow exploration of the chute and its position points to great permanency and probably an enormous reserve at further depth this great body of milling pre ore is a distinctly separate resource ree from the other great ore bodies boOie of the mine it occurs in a steep pitching fault fissure that has dislocated the strata by a normal to the northwest and has an important bearing on the probable deep aliza tion of the district it indicates that the profound faulting and fissuring of the district was probably contemporaneous and that the was subsequent to both similar deep fault fissures were a pronounced I 1 feature of the leadville district in colorado they however horev er were generally barren of pay ore and the fact that this class of deep earth movements are richly ore bearing in the park city district is quite a strong argument for the probable aliza tion of the lower contact horizons as previously indicated another new and in te resting phase of park city veins is the re rei i mar kably rich gold values now being found I 1 in the american flag mine this property 1 I 1 carries a well defined fissure vein in the ontario quartzite closely parallel to a big didd dik of porphyry it has been developed to a depth of feet is four to six feet wide gidej and contains average values of 20 tor to 30 per ton in gold and silver together with a well defined pay streak of shipping ore along I 1 the foot wall that is as much as eighteen inches thick in places and carrying values of four to eight ounces gold in addition to an equal value in silver the quartz in this vein is perfectly oxidized and looks as if it would be easily treated by a 9 simple leaching process and is in marked contrast with the base smelting smelling sm elting ores of the camp the enormous possibilities of the extent of the proven mineral bearing territory adjacent to park city and extending co connectedly i all the way to the big and little cottonwoods Cotton woods is I 1 not lot half appreciated by the people of salt lake city and of utah and it is unlikely that the full maturity of its development can be reached in III twenty years I 1 know of no other mining district in the west that promises better results for the judicious investment of capital than does park city |