| Show ri irti 0 ti c ic Produces ro u e 2 O i p Ix X of Annual Output o Of f Silver and Lead Is Still Par Far in in the Future early arly Production Is Now Estimated by United j States Government at By Ira C. C Tichenor M TH ITH a record production of approximately V there is every indication that the great Tintic district has a ag ag avay g way vay yet to go before it reaches the apex of its annual output principally silver and lead mines which at various times during the past half talf miry tury made mining history for Utah continue to add their porn porn por- por por- por n to the production of minerals and estimated at about 10 o 0 a year while newer mines have entered the producing list j d still tilI others seemingly ly are on the verge of f still further furth r adding the he Ii fame of the district and of Utah as a producing mineral state As a matter of fact considering the preparations in progress explorations at depth in some of the older workings the success ending en ing development work in newer mines the favorable prost pros pros- t Hn in a number of properties and recent inauguration of work several holdings and the plans already tentatively adopted for fori development i of still other properties it would seem that the activity 1 in the Tintic district has but just begun MINE HISTORY is RECALLED This might not sound reasonable to those who remember the 1 history of some of the older properties with their continuous Auction u tion up to the present day but it must be remembered that a new zone has been proven within the past two years several other mines in this same region seemingly ar are on the ge ge of becoming producers while a number of others are con- con ng operations under the most favorable conditions and with pry rr prospect of success of the older mines and which give promise of a continuation activity for many years to come there might ht be mentioned the diva the Gemini Eagle Blue Bell Bullion-Beck Bullion Chief Iron Colorado Grand Central Mammoth and Black Jack Isom UTO To the Tintic Standard which is located in the section known me lie East Tintic district belongs the honor of having proven tc lly ica-lly a new zone The indications are that the Eureka lion n a close neighbor of the Tintic Standard will be the next Ij join in the list of producing properties while the Eureka Lilly just between n the Tintic St Standard and and the Eure Eureka a Bullion was strong evidences of becoming the third of a trio of new and which may be changed chang into a foursome by the operations of I the Lehi Tintic at the northern of range Still other promising properties are the Copper Leaf lying t to north of the Eureka Bullion the North Standard located been beeri be- be eri en the Copper Leaf and the Lehi Tintic and the South Standard I Apex Standard lying to the south of the Standard Among the holdings on which operations have just begun are i East Tintic Coalition and the Big Hill whose holdings adjoin I 1 which of the Eureka Bullion I are neighbors the Paymaster a of the Lehi Tintic and the Central Standard whose pl plant nt sight of that of the Copper Leaf r TICS IMPORTANCE RECOGNIZED That the importance of the Tintic district as a mining center recognized by the government is shown by the thee publication of ak a k comprising about pages copies of which have just been 1 ived in Salt Lake containing a a history of of the district with res res' res of of illustrations and maps laThe AThe book which is issued by the United States geological vey was written written by by Waldemar Lindgren and G. G F F. F Loughlin historical review by V. V C. C Heikes The introduction by ms Lindgren and Lou Loughlin hlin is as follows I nt Park City City and Bingham m h have ve tys ty's been been the three great silver lead lu luring districts of Utah Of late years ham has also become c one e of the m nta copper districts of gf the thed d and Tintic has likewise entered ranks o of the great copper camps le district named after sitter a noted an chief of the Ute tribe Is about mlles miles south of Salt Lake City in East lEast Tintic mountains the most of the Basin ranges This range southward continuation of the ti rich H rich Oquirrh range and lies only west of the mighty Wasatch t From 1869 to the end of 1916 acing ac- ac ing to to statistics compiled complied by V. V C. C 68 eB metals have been produced In district to the gross value of 48 48 Tintic is a district of complex in order of value silver sliver lead copper and zinc Besides which P bismuth arsenic and antimony are ered The annual production g had to a maximum early sarly In 1912 careful geologic examination of the districts I named above was planned nearly date by the United States Stales glea survey and carried out under i direction of S. S S S. F F. Emmons The I cI was published in 1898 the work having been completed In 1897 1891 and economic studies undertaken by G. G W W. Tower and igneous rocks were Investigated by bye summarized e Smith The results were I in folio 65 of or the Geo- Geo of the United States by r. r and Emmons This folio a map of an area of of twelve mlles e which Includes the lin the district on or the Ibe scale cale oft of It t and a map of a l larger area now called the Tintic quadrangle Including the central part of the East Tintic mountains mountains mountains moun moun- on the scale of or about one mile to the inch These maps have been revised and reproduced as plates IV and I respectively of the present report PRODUCTION DOUBLED DOUeL Since the first report was published the annual production of or the district has about doubled the development work both laterally and in depth has increased enormously and an entirely new line of ore deposits on the east side of the district district district dis dis- has been opened The director of the survey therefore decided that a re review review review re- re view of the new developments would be desirable The resurvey was assigned in 1911 to the present authors the tion of the structural and igneous geologic features was undertaken by G. G l F F. Loughlin and the Investigation atlon of the ore deposit by Waldemar Lindgren ren who also had general supervision of the work The field examination was made in the thelast thelast thelast last two summer months of 1911 and the district way was revisited for a short time by Mr Air Loughlin In 1913 and by both authors In 1914 Mr Air Loughlin also assisted inthe Inthe in inthe the examination of some of the mines and studied the oxidized zinc ores The resurvey was confined chiefly to the area of the mining district proper Work beyond this area was limited to outlying mining districts and points of special geologic Interest A more detailed study has resulted In Inconsiderable Inconsiderable considerable revision of the mapping of Continued on on page 3 tic District Produces And Real Has Just Begun Continued from page 1 area based on the dis- dis fossi localities by F. F B. B i 5 and U. U F. F Loughlin The fault ault faults s ha e also been worked out more Revision of the geology of the las has consisted chiefly in detailed mapping and description mine owners of the district have havethe havethe the resurvey by the most cordial atlon With two exceptions forI for- for I of minor Importance all or underground work mine maps assistance stance of various kinds was wasP ully furnished are due to the gentle- gentle n charge of the Knight properties to Jesse Knight and Riter Milan L. L Crandall Jr en Ifor these properties spared no noor or effort in furnishing data and Hof the most important sections of round ground workings used in this report ples of ot his careful and exact surI sur- sur I hanks are also aiso due to J H. H McChrystal C C C. Griggs C. C E. E Allen Alien ewson rs r's Smith it fo for many courtesies en I office work on data and specimens I much time The new dato research have havo applied to the study of the ores work the senior semor author has aid from W. W L. L head and A. A II H. Means of the Mas- Mas etts eUs Institute of Technology All work has been done in the 1 Ic laboratory of this institute Means Menns and Whitehead have esy esy es- es y assisted in the examination of d sections and have made most moat 11 excellent photographs of such I lens here reproduced They have lone special work on the miner miner- ot HIle district The fossils col- col have been examined by G. G tyland Edwin Kirk of ot the United I geological g survey Many n chem chem- e l f of f ores r rh have hae e b been made a by Wells also of the geological survey work and suggestions have been appreciated Several minerals een Jeen determined by W. W T. T Schaller Schallert same organization t emo ogi manuscript of this report was for tor publication a paper on district by Crane has been led This paper differs from the I in the nece necessarily arlly arbi subdivision of the sedimentary Ions and in the interpretation of features of of the he igneous rocks It the more general features ore re deposits regarding which it the present report IN ED BY DEVELOPMENT Further comments on this re- re fr the Tintic mining district can b be added b by one of the thesis thesis' sis sis' snaking making the earlier survey rison of the later mapping with r brings out differences that part Ipar explained by the much ex- ex mi mine development and the later of fossil foss localities but that artmore art arb to more thorough field work Ii aon n of the workers engaged in Investigations q of this area need ne-d made but it is 15 of value to com com- n hods and standards of work worl ur een years rears between 1897 and 1911 ers ears rs of progress in geologic though no great changes in f notable discoveries were made f a steady improvement in len l ome field workers adopted re- re n p. p mapping arlier earlier than others tor quantitative e results was wash JI h th of the earlier ge- ge iU Mr Gilbert than with other Nen sn of ot a later day but on ere Is apparent a steady exactness in map tt ti accuracy c in n results ill d Ir iii are being i adopted e in both m I all to the end of ot more useful With this flU of standards it Is Insists compare the resurvey with lIer Her work It is believed that the theste ste responsible for the original OI nn bave done better work in dId In 1897 and that of the present report e teen been less successful In 1897 h been in this piece of ot tt tt G. G. G. G O O. S. S ND DISTRIBUTION p Its of the Tintic district w a in a a. small email part of the thes s ige e In which there are e of rhyolite of pora por- por a that are for tor the then J- J n of ot ore deposits The small email area mainly on one I I e measuring about four With h i to south and two miles to west See fig 1 p. p 15 IB fig Pl IV lv In pocket It extends liver City to a point north of Eu- Eu There are however outlying areas deposits of greater or less lessI lessOn I On t the south t prospects t are found 1 rt d liver r City to Diamond i on the east deposits of the East Tintic die dis- I about two miles east cast of ot the divide I of the e range on the e north rt about nine I miles t fl from m ek Eureka ureka k ar are tIo the Scranton a l I mines of ot the North Tintic district but in I the same region there are large limestone lime lime- I stone areas Practically barren of ore deI de de- I posits ts I The general reached its I maximum l In n the area of east I 01 ot of silver City an City an area one and a half I jH miles milea long one and one mile wide wide but but In this I vicinity Si there are few tew mines that have havo I yielded a great production The monI mon- mon I and adjacent parts of the other igneous rocks are extensively altered and nd I Impregnated with pyrite these rocks are arc also traversed by fissure fis fis- a great number of I sure veins having a generally northeast northeast- I erl erly trend and steep dip which V F some Ui of V I have havo yielded considerable amounts of ore on I from their oxidized zones above water wate I level Among the mines on these veins velna I are the Undine Sunbeam Martha Wash Vash I ington Murray Hill Hili Silver Bow and andI I Swansea The Swansea mine mme is in the I intrusive Swan Swansea sea rhyolite near the mon mon- contact There Is no distinct line liner I r between the and the altered I latHe porphyry in part at least effusive ef- ef I on the east and the veins ClIt both rocks This mineral zone is oneana one I and ana a half miles wide from east to west I but very little work ha hap haft bc been n done on these deposits in the last twenty years I in most of the mines work was stopped I when large quantities of water were encountered encountered encountered en en- countered from ito to feet below the surface The Tho Swansea is the only one of I these mines that has been worked below I water level in recent years vears I The sedimentary ro rocks ks north of the are not generally mineralized but they contain a number of vein zones along which the limestone and dolomite are s for widths ranging from a afew afew few feet up to or feet teet Outcrops of ore occur In places but are neither continuous nor common and are confined I chiefly to the southern part of ot the limeStone limestone lime lime- lime lime-I I stone area The great mass of the sedimentary sedimentary sedi sedi- rocks is barren of ot ores and I The main mineralized I Izone zone of ot the crosses the contact contact contact con con- conI I tact at three places but it is not possible possible possible ble at any anyone one of ot these places to trace continuous outcrops and the northward continuation of this zone forms the Mammoth Mam Mam- I moth vein zone in the limestone I IVEIN VEIN ZONES DESCRIBED Four zones of northward trend are I recognized in the limestone For purposes purposes purposes pur pur- purI I poses of ot description these are called be beginning beginning beginning be- be beI I ginning with the westernmost 1 the Gemini zone comprising from north to I south the Ridge and Valley Gemini Bullion-Beck Bullion Eureka Hill and Centennial Centennial Centen Centen- nial mines 2 the Mammoth l zone comprising comprising com corn cornI I from north to south the Chief I Eagle Eagie and Blue Bell Victoria Grand I Central Mammoth Gold Chain Opo- Opo hongo Lower Mammoth and Black Jack Jact i mines 3 the Godiva zone comprising from north to south the Godiva May 1 I Day ay Uncle Sam Humbug Utah Northern North North- I em ern Sp Spy Carisa Red Rose and North I IStar Star mines and 4 the Iron Blossom zone comprising from north to south the Beck Tunnel Colorado Sioux Iron I Blossom Governor and Dragon mines I IThe The Gemini zone does not cross the I contact but is closely connected connected connected con con- conI I with the Mammoth zone in the lower workings of the Centennial Eureka and Grand Central mines as outlined Inthe Inthe in inthe the following paragraph At a depth of about 1700 and 1800 feet I in the Lower Mammoth mine min a contin- contin ous vein crosses the contact into the I limestone and has been moderately pro pro- A little north of the Lower I Mammoth a series of ot northeasterly north-northeasterly and northerly fissures carries the ore Into the Gold Chain AJax and Mammoth properties The Mammoth is one of the most productive veins of ot the district A lateral fissure a little to the west carries the ore on northerly fractures up through the Grand Central Victoria Eagle and I Blue Bell and Chief mines all in the Mammoth zone A westward dipping fissure fissure fissure fis fis- fis- fis sure in the Grand Central carries the ore down to a depth of 2200 feet whence it communicated with the lower flat ore bodies in the Centennial and thence ascends in the two great ore columns of the Centennial which follow strong easterly east east- erl erly dislocations From the upper levels of the Centennial the ore now in th the Gemini zone is governed by northerly es res which carry it through the Eureka a Hill Bullion Beck lo C Gemini and andRidge I Nn Ridge aa a and |
