Show GEOLOGY GT EO T LOGY r T OF 0 F F T MX MT H cr BALDY BA T A T L ar DY 7 GOLD G 0 rt L T BELT P B BY Y J F G GIBES I 1 B B S marysvale Marys vale division barring t complex conditions caused by UlA unusual usual faulting laul ting along the foothills on the east cast and back into the mountains a distance of from three to tour four miles the geology of the marysvale Marys vale division is easily read it is clearly evident that at some depth the entire range is with a broken and faulted substructure of quartzite and that it may be credited to the devonian age A small area to the north of the gold run canyon road presents some contradictory evidence the overlying limestone contains fossils credited to an earlier age than the devonian its presence is an enigma and 41 cannot be discussed at this time the preponderance of evidence is that the area now represented by the mt baldy range lange and its northern prolongation the mountains between millard ard and sevier counties was vas under the ocean dur ing the devonian age hundreds perhaps thousands of feet of sandstone was deposited the succeeding lower carboniferous 1 period covered the sandstone with a thick bed of limestone at the close of the lower carboniferous a gentle upward movement occurred and the ifie area under discussion rose above the surface of the ocean inhere where it remained dur ins ing the enormous lapse of time that inter be between tween the closing centuries of the lower carboniferous and well along towards the close of the Tertia ray age when an almost worldwide world wide change of level becu occurred along the east cast side of and parallel with what is now known as the mt baldy range and its northern prolongation the 1 a range the earths crust was fissured from the surface down to the region of molten rock the fissuring was succeeded by faulting and an idea of the tremendous displacement may bo be formed from the statement that deer trail peak the highest elevation of quartzite is fully feet higher than the I 1 valley while the eastern section of the quartzite is bulled beneath hundreds of feet of basalt and other eruptive material tho displacement extended northerly a distance of nearly miles in sevier valley the sandstone so eo conspicuous along alie th e east cast side of the mountains is on the east cast side of 0 the valley buried under hundreds per perhaps p s thousands th s ps op sep JL OX p 01 0 1 r f i c J sj n j s A tion material this stupendous displacement is irown as the sevier fault in the vicinity of marysvale Marys vale a great fissure il s on the east paralleled the sevier fault and is now marked by a fringe of basaltic foothills and volcanic activity must have continued over a long period after comparative quiet reigned along the mt baldy range the evidences evidence es of which are found in the mixture of volcanic bombs and debris tin a belt of oolite bullion canyon represents a lateral fault extending westerly wb sterly from the sevier fault the apex of the divide between two mile alile and bullion is quartzite and is fully 1500 1600 feet higher than the quartzite L to the north of bullion Bullio nC creek another area of stupendous displacement exists along the cottonwood fault where doer deer trail peak rises fully 1000 feet above the quartzite on the ridge to the south of cottonwood the topographical and cross section maps to which the readers attention is invited will serve to illustrate the profound northerly and southerly faulting of the basic formation of the mt bit baldy range the joachin teachings s of goo geology log gy prove that the 0 t 11 PO ph r vo Q R ayol I 1 vv to V ay B exl ir e p ra 0 I 1 t 1 LV PP L 0 1119 r C IP am ye W U ora cc t if J grafl H VV e 1 va V ak S v S b 16 L 6 A z v n I 1 n AU t ii 1 4 wilk p 10 A 1 oil 0 ZU 61 P V pa 0 A ij T P nn la ora t 01 gap U Z Z KNIP X I 1 Y 40 3 1 I 1 ja t 1 11 V az A t U X fit C T 11 40 F fj A ty W i L pig I 1 gr N 16 topographical MAP MT BAL OY alar dynamical history of the region to the west and southwest of marysvale Marys vale is as follows A large area occupied by sandstone with a limestone capping because of the shrinkage a t e of the earths molten interior or because of the accumulation of gases seeking lines of easement casement tho the crust was fissured and broken into enormous fragments or blocks some of the great masses maintained their position but the larger portion settled down into tho yielding massof mass of underlying 0 igneous matter i prom from those yawning fissures enormous enor moun masses of and birdseye birds eye porphyry oozed up from th the e earths melted interior and formed mountain masses thousands of df feet deep again the mi stAble brugt quivered with intense seismic forces the old and but partially healed wounds were opened and new fissures formed forrie lin in the overlying eruptive mass and great dykes of highly mineralized erali zed porphyry now mark the location and direction of many of those ancient rents through the weight of the superimposed super imposed mass of eruptive material the associated heafy raa and arp f pf af 09 P i A T r v 1 I fy underlying sandstone was altered ch Langea to the now familiar quartzite there are deveral localities where the sandstone escaped c tho those se agencies and retains its old time characteristics and insensibly in wn sibly merges into quartz quartzite ite aas it nears the igneous formations mat ions the brief period ibi iba comparative quiet which succeeded the ithe previous disturbances was war broken by another uplift of the range and along the central portion extending from gold mountain south a distance of some iten miles mlle s a great fissure was formed from the surface down to the region of liquid fire the mighty force which split the northern portion of the mt baldy range also formed lateral fissures extending easterly and westerly from the great t reat central rent those assures became lines of casement e for the vast mass of magma seeking ol egress gress and from molten depths the hot gaseous mud flowed upward and formed great dykes of phonolite which today cheerily clinks under the feet of an occasional prospector while the eruption of the phonolite marks the last throes of nature in th the mt baldy region subsequent local fissuring of the phonolite occurred and in connection with other fissures a already formed became channels for the upward and lateral flow of gold and silver bearing solutions extinct craters fields of dark colored tra chite ridges of volcanic breccia dykes and chimneys of obsidian in the phonolite prove that local volcanic forces were co continued n over a long period after the widespread eruptive activity had ceased the i readers ea ders attention is now directed more particularly to the topographical and cross section n maps while we investigate the economical results of dynamical forces just described to avoid confusion the great porphyry dykes only have been mapped and the veins eliis along the trend of those dykes are prominently drawn the cross se section atlon shows the deer trail mine occupy occupying in g a blanket contact which alps to the north at about eight or ton ten degrees greensand grees sand and is hidden by overlying debris in that locality the owners owner s have blo blocked clied about tons odbre of ore having an average value of ton ten or twelve doll dollars ars per ton about feet distant to the south many carloads of ore were shipped and which netted the owners several hundred dollars per ton in lead s silver ilver and gold it is believed that the contact derived its filling by solutions 1 from rom the north where eruption rock is in evidence and probably associated with a lateral fault the high grade ore to the south doubtless owed its origin to a secondary movement of solutions which passed through the large body of ore leached beached it and transferred the concentrates to the higher high r portion of the th e contact higher up on the deer trail escarpment is situated the lucky boy that years ago yielded aarao a largo quantity of high grade mercurial ore the origin of which is an unsolved problem still higher on the mountain side is situated the once famous pluto like the lucky doy boy it proved to io be a surface deposit in limestone the ore was almost pure silver and with no visible reason for its presence in a locality where conditions ans am seemingly J y so unfavorable the first great porphyry dyke that traverses almost the entire district occurs about three miles west from the mouth of cottonwood canyon and occupies the great northerly and southerly fault line along this dyke is situated the nelson a vein of gold bearing quartz that projects above the ground like a great wall the branch vein is strong and its permanency ina nency has been proven tt it yields silver anu ana gold the st standard is a monster ledge and ami yields lead silvor silver and gold almost exclusively in sulphide conditions on the north end of the dyke is situated the copper belt to the west of the crystal mine anh trending northerly is a great dyke of porphyry that after traversing the marysvale Marys vale section bends northwesterly into the gad gold mountain district along this dyke is situated 1114 10 flo blawn Bv AWn JD a ar W V r C high grade ore and now has exposed a 15 i foot vein that aver averages ages 20 per ton ane property is being worked by pittsburg Pitta burg peo plo and ought to develop into a bonanza down on the ahe mullion bullion creek side the dyke forms the hanging wall ivall odthe of the webster a an monster onster vein with great chutes of galena zand rand lead carrying gold and the basalt extends some threet to tour four miles north of the canyon and Is isalio also bounded by rhyolite and other eruptive rocks tho the upward climb from robinsons to gold cold mountain is among basaltic buttes weathered vea to fantastic shapes and highly colored or through the action of dishong saron solutions ullo tho basalt extends arto e JI i dutli 01 cr 4 j A J I 1 10 4 t 41 7 ja ja j 0 V pori 4 1 brors S R kai ol 01 i t e act artzi Look ilig N ta silver space will not permit of any description eption of the horse heaven and other fine properties itts along the great webster dyke another monster dyke cuts the country from the east cast side of mt delano over into bullion canyon there is a largo large number bumbel of fine properties on the dyke and contiguous to it A study of the maps will cop convince yince anyone at all familiar with the relation between geological conditions and the occurrence of veins and values that thal the country to the west of Marys valo presents one of the mos most inviting fields for intelligent investment to be found in inthe the united states 0 GOLD MOUNTAIN DIVISION tr X alighting fro from m the train at sevier station on the R G W R R the observant traveler to gold mountain will notice that the rugged and broken foothills are composed of basaltic material As one proceeds west westward vard and enters clear creek canyon he will note within a mile or so of gold mountain a and n d to the th e stranger is a subject of curioli curiosity i Y interest aud and study in ili some localizes loca lites the basalt caps the rhy rhyolite alite but in a general vay it merges so grad gradually wally into tile the rhyolite that no line of mar kation is visible contemporary with the great Sc S evier vier fault rand d extending westerly wes the earths crust was profoundly broken or fissured alon alona a line now represented by clear greek creek canyon and intersected and crossed by tile the great fracture which once extended irom from southwest of MaryB vaIe along the pre present sent apex of tile the range through gold Broun mountain tain and onward to the north into the Pa livant range those principal fissures including innumerable parallel fissures were openings for the upward flow of rhyolite rhy olito and kindred eruptive material prior to tile the complete solidifying of the rhyolite hy olite the clear cleaf creek fracture reopen reopened bd arid basaltic material was forced up through the partially congealed rhyolite and which explains the mending blending of the line jine ot 01 contact beginning a short di stanca north orth of the r 7 77 L T 7 7 L 7 4 71 7 1 Z q 7 7 A Y Z 2 0 L 1 A 4 arv 5 nelv ile Y C A Q n WA Js S aa rz 1 I 41 aizo A P d ja R p V 14 as 1 0 0 1 u a S 1 RU rd i 41 e le we x ae 4 r ag 0 N 1 opt P lit C 07 A A 5 J 3 i do ak 0 L M UA 40 UN T AIN DIVI io bb BALDY T tho ahe tact fact that the gorge has been ploughed sloughed hed deep in a bed bedaf of basalt which as robinsons ranch is approached becomes more colum liar in its structure the bed extends westerly from sevier station a distance 0 of some fourteen miles where rhyolite becomes the country rock and forms the apex of the vange flange the earlier geological conditions of the mt baldy mineral belt are described in the 2 marysvale Marys larys vale division of the subject and to annie laurie sec sea topographical map a belt of birdseye porphyry extends I 1 southerly a distance of a mile or two and disappears under the more recent roc rocks ks to the east of the th annie eAnnie laurie an enormous belt comes in from mt aft belknap and forms the divide between kirn kim berly basin and the ille head of deer creek and is also so far as exposure is conce rend the east cast local boundary of the birdseye this peculiar porphyry with its d dark ark base ana with alst almost lyme X specks and spots extends westerly oyer 07 er tile tho tiptop divide and down towards fash creek odthe of the magnificent annie laurie vein or veins is towards the west and on oil ay that at a distance of perhaps or 00 feet from the droppings crop pings is a dyke of porphyry entirely distinct from the country variety the locality where the dyke is most ln prominently exposed is on the hillside to s the southwest of the blue bird tunnel the tiptop divide is the apex of 1 a 11 e dyke of i porphyry which occupies a northerly and southerly fissure or line 0 of 41 fl 1 faulting tile the great sevier ledge with its marvelous wealth traverses this dyke on a ih 6 s southerly auth orly strike and upon which tile the tiptop and otlie other are situated southwesterly from tho the tiptop the formation changes the birdseye hird bird soye saye porphyry on the surface at least gives way to rhyolite and tra chite faulting is more conspicuous ind and explosive volcanic activity more in evidence within this area and well in towards grand old baldy is situated the fine property of the trappers pride the geology of the locality is given by a gant gentleman leman intimately associated with the mines andis and is lis as follows the country rock is altered to which has undergone a series of s faulting and thereby tending to malco make it POT per to the action of mineralizing mineral izing solutions the faults fa tilts so far as have determined are parallel with the veins thus far no lateral faulting has been terca I 1 to tho the cast and southeast of the trappers pride palde and directly north of mt iol del knap Is a great held field of phonolite nearly all of bilich Is is highly stained with tron iron oxide i the locality yields beautiful specimens of nephritic phonolite pho nolito several undeveloped but most promising veins are opened with short tunnels the decomposed filling pans gold in milling quantities in a gener general al way tho gold mountain A fa faults lifts dykes and veins coins trend towards that 4 uplift represented by baady and belknap and incidentally proves that the i J majority of the lodes are true fissures il f gash veins occupying althey do shrinkage a age le cracks in the tooled cooled eruptive rock lack the regularity of strike so conspicuous it in the vein system of if the major portion of tile the avit uta baldy region M I 1 it was intended to outline tile the M formations but lack of time a at t f the last moment prevented the map will lio however vever serve to |