| Show GEOLOGY OF MT BALDY golf GOLD ELT BELT DD 11 B BY Y J F GIBBS io i IS y V DIVIS Divi division lorli barring complex conditions caused iby y unusual faulting along the foothills on tho east cast and back into tho the mountains a die tanco tance of from three to four miles the geology of the marysvale Marys vale vaIe division is easily read it Is clearly evident that at some depth the entire range is with a broken brohen 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 D devonian ey onlan its presence is an enigma and cannot he be discussed at this time the preponderance of evidence Is that the area now represented by the mt baldy range and its northern prolongation the galivan mountains between millard and sevier count counties les k was iwas und erthe ocean during the devonian age hundreds perhaps thousands of feet of sandstone w was as deposited cited the succeeding lower carboniferous period covered the sandstone with a thick beu of limestone at the close of the lower carboniferous tion flon material this stupendous displace 1 ment is known agthe as the sevier fault in the vicinity of marysvale Marys valo vale a great fissure on the east paral paralleled lebed the sevier fault and isnow is now marked by a fringe of basaltic foothills and volcanic activity must have continued over a long period after comparative quiet reigned along tho the mt baldy range the mhd evidences of which in the mixture of volcanic bombs and debris in a belt of lo oolite olite tull bullion ton canyon represents a lateral fault extending ve westerly sterly from the sevier fault the apex of the divide between two mile and bullion is quartzite and is fully 1500 feet higher than the quartzite to the north of bullion creek another area of stupendous displacement exists along the cottonwood fault where 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 ther the basic formation of th the theat eMt mt baw baldy range the tea teachings chiho as of geology prove that the acty Af ty I 1 14 ohp ii 10 4 49 Q rh w r A 4 bestone ops aps I 1 I 1 QU r Z g te W av i rd baffi I 1 p ko 01 ol e co coa 5 5 sl dc ak 3 ye mc m V 5 0 toe art aw r I 1 3 1 I v ru 2 a aa 0 o N feil 14 3 rth 1 awo i kovl K WL LH J r W 5 S 1 eli IT 0 1 af X e i t 1 k n I 1 v 1 A M 0 0 V J T Z WO I 1 0 A ais q a w N 4 r 1 dal Wb wals fe ls ri iaci amal AM Ci wl N as f anif mu 5 rr V V AM w ira sifi f alx aa at 1 4 1 iq lm byg A U s v s xa iff W N A A hy g hsi ayk e WU Ni niia 1 r pl 1 iw 1 l iS sf w ia WA g r y achs may 3 flip t sw M s 1 dr i i wo ma tela U I 1 ay V ra f M sf f ssta ss 1 tK za all alt Q 4 ca fw mv sif ali N 7 I 1 f 0 4 abw z 4 S 0 P tr t r ra PH agal NA MAP P 11 hT 1 BALDY N I 1 N E RA manua str alc DIVIs con aon v 14 a gentle upward movement occurred and lt 1 alie area under discussion rose above the i surface of the ocean where it remained dur ra ing the enormous lapse of time that intervened between the closing centuries of 0 the ld 10 W or carboniferous and well along toi towards Yards f the jhb close of 0 the ter Tertia alaray ray age when an al most worldwide world wide change of level occurred chutrod Cu Trod along the eastside east side of and parallel with ith what is now known as the mt baldy range ana and its northern prolongation the range the earths carth 9 crus crust was fissured from s the surface down to the region of molten 4 rock r the fissuring was succeeded by faulting t and ana an idea of the tremendous displacement may be formed from the statement that deer trail peak the highest elevation of quartzite is fully feet higher than the valley while the eastern section of the quartzite quart zito is buried beneath hundreds eds of feet of basalt and other crup eruptive tiVe material the displacement extended northerly a distance of oV nearly miles in sevier valley the sa sandstone lidstone so conspicuous along the east side of the mountains is on the cast side of the valley burled buried under hun of beet feet of arup i K dynamical history of the region to the west and southwest of 0 marysvale Marys vale is as follows A large area occupied by sandstone with a limestone capping because of the shrinkage of the earths molten interior or be cause of the accumulation of gases seeking lines of easement the crust was fissured and broken into enormous fra fragments ments or blocks some of tho the great masses masses maintained their thal position but the larger portion settled down into the yielding mass of ofa underlying igneous matter from those yawning fissures enormous enor moun masses of and birdseye birds eye porphyry oozed up from the earths melted interior and formed mountain masses thousands ot of feet deep again the unstable anist able crust quivered with intense seismic forces 7 ther theold old and but partially dlly healed wounds were opened and new mew fissures formed in the overlying ng orup five mass and great dykes of erali zed porphyry ty 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 heat and of felons the Z V 4 A i h underlying sandstone was altered changed to the now fam familiar ar quartzite quart zito there aro are several localities where the sandstone escaped those agencies and retains its old time characteristics bics tics and insensibly merges into quartzite quart quartz zito as it nears Inears the igneous for lations mat ions the brief period of comparative quiet which succeeded the previous disturbances was broken by another uplift of the range and along the central portion extending i from gold mountain south a distance oi of some ten nilles miles a great fissure was formed from the surface down to the region ol of liquid fire the mighty force which split the nor northern portion of the mt alt baldy range also formed lateral fissures extending easterly casterly and westerly ly from the great central rent those fissures became lines of ease ment for the vast mass of magma seeking egress and from molten depths the hot gaseous mud flowed upward and andl formed great dykes of phonolite which today cheerily clinks under the feet of aty an occasional prospector while the eruption of the phonolite marks the last throes of na ture in the mt alt baldy region subsequent local fissuring assuring of odthe the phonolite occurred an and d in connection with other fissures al af read ready y formed became chann channels elg for the up ward and lateral flow of gold andi silver bearing solutions extinct craters fields of dark colored col orecT tra chite ridges of volcanic brec breccia cla dykes and chimneys of obsidian in the phonolite prove that local volcanic forces were continued over a long period after the wide spread eruptive activity had ceased the readers attention is now directed more particularly to the topographical and cross section maps while we investigate alia jhc thc economical results of dynamical forces just described de to avoid confusion the great porphyry dykes only have been mapped and the veins along the trend of those dykes are prominently drawn afie cross section shows the deer trail mine occupying a blanket contact which dips to the north at about eight or ten degrees degree grees s and is hidden by overlying debris in that locality the owners have blocked about tons of ore having an average value of ten or twelve dollars 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 silver and gold it is believed that the contact derived its filling by solutions from the north where eruption rock is in evidence and probably associated with a lateral fault the high grade graab ore to them the south doubtless owed its origin to a sec andary movement of solutions which passed through the large body of ore leached beached it s and transferred the concentrates to them the higher portion of the contact higher up on the deer trail escarpment is situated the lucky doy boy that years ago r qi 5 yielded a I 1 large arge quantity of high grade mer curial or e the or origin gin of which is an un solved problem still higher higger on the mountain sloe side is sit u ardd the once famous pluto pito like the lucky boy it proved tobe to be a surface deposit in limestone the ore was almost pure sil 4 ver and with no visible reason for its presence in a locality where conditions aro are i seemingly so unfavorable the first great porphyry dyke that tra y verses al most almost the entire district occurs about three miles west from Vom the mouth of cottonwood canyon and occupies the great northerly arid southerly fault line along f this dyke is situated the nelson a vein ot of gold bearing quartz that projects above the ground like a great wall the branch vein is strong and its permanency has been proven it if yields silver and gold the standard is a monster ledge and yields lead silver and gold almost ex excle XIU i 4 in sulphide conditions i on the north end of the dyke is situated the copper belt to the acs west of the crystal mine and trending northerly is a great dyke of por phyra that after traversing the Marys vald section bonds northwesterly into the gold mountain district along this dyke is sit up groby t 1 high grade ore and now has exposed a 15 foot vein that averages 20 per ton the property is being worked by pittsburg people and ought to develop into a bonanza down on the bullion creek side tho the dyke forms the hanging wall of the webster a monster vein with great chutes of galena and crystallized lead carrying gold and the basalt extends some three to four miles north of the canyon andis also bounded by rhyolite and other eruptive rocks the upward climb from robinsons to gold mountain is among basaltic buttes weathered to fantastic shapes and highly colored or discolored through the action of strong solutions the basalt extends to 01 Y J I 1 q rd 1 I WT ICY Y Z K 41 1 MOs isom 1 az 1 Pho molit jt 1 op I 1 cross leellon c i L 0 M from it y silver space will not permit of any description of the horse heaven and other fine properties along the great webster dyke another monster dyke cuts the country from the east side of mt delano over into bullion canyon there is a large number of fine properties on the dyke and contiguous to it A study of the maps will convince anyone at all familiar with the relation between geological conditions and the occurrence of veins and values that the country to the west of marysvale Marys vale presents one of the most inviting folds fields for intelligent investment to be found in the united states f 0 GOLD MOUNTAIN DIVISION alighting from 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 westward and enters clear creek canyon he will note within a mile or so of gold mountain and to the stranger is a subject of curlo curiosity sity interest and study in som some e localizes loca lites the basalt caps the rhyolite but in a general way it merges 0 so gradually into the rhyolite rhy olito that no line of demarcation mar cation is visible contemporary with the great sevier fault and extending westerly the earths crust was profoundly broken or fissured along a line now represented by clear creek canyon and intersected and crossed by the great fracture which once extended from southwest of marysvale Marys vale along the present apex of the range through gold mountain and onward to the north into the range those principal fissures including innumerable parallel fissures were openings for the upward flow of rhyolite rhy olito and kindred eruptive material prior to the complete solidifying of the rhyolite the cleat clear creek fracture reopened and basaltic material was forced up tip through the partially congealed rhyolite and which explains the blending of the line of contact be beginning inning a short distance north of the E 7 7 C Z pg of at vs 4 ltv AIL n A omit NA q in 0 fo to P G r ra f t ix elf 0 ja OPP A e W vp b I 1 0 fa P ot K clec 1 I roe I ili A 1 I 1 Y IN r N C 41 R A P 11 raa L N 0 V 4 aaa VM the fact that the gor gorge gehas has been sloughed ploughed plou ghea hed deep in a bed 0 of E basalt which as robinsons ranch is approached approach edi be becomes more colum nar in its structure the bed extends westerly from sevier station a distance of some fourteen miles where rhyolite becomes the country rock and forms the apex of the range the e earlier arlier geological conditions of the it r alcaly mineral belt are described in the division of the subject and to viela vi elv the reader i ir respectfully refea annie laurie see topographical icar map a belt of birdseye porphyry extends southerly a distance of a mile or two and disappears under the more recent rocks to the east cast of the annie laurie an enormous bolt comes in from mt bellamy and forms thle th divide between kimberly basin and the head of deer creek and is also so far as exposure is the cast local boundary of the birdseye this peculiar illa porphyry with its dark base basea and fiyod fiU od with almost white 1 l specks and spots extends westerly ovet over the tiptop divide and down towards fish creek the dip of the magnificent annie lauria vein or veins is towards the west and on that side at a distance of 0 perhaps ot or feet from the droppings crop pings is a dyke of porphyry entirely distinct from the country variety the locality where the dyke is most prominently exposed ts is on the hillside to the southwest of the blue bird tunnel the tiptop divide is the apex of a jarge dyke of porphyry which occupies a northerly and southerly fissure or line no of faulting the great sevier ledge with its ita marvelous wealth traverses this dyke on a southerly strike and upon which the tiptop and other bonanza claims are situ sittia ted southwesterly from the tiptop the formation changes the birdseye bird porphyry on the surface at least gives way way to rhyolite and tra chite faulting is more conspicuous 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 gentleman intimately associated with the mines and is 19 as follows the country rock is altered which has undergone a series ot of faulting and thereby tending to make it per pen to the action of mineralizing mineral izing solutions the faults so far as developments develop have determined are parallel with the veins thus far no lateral faulting has been encountered to the east cast and southeast of the trappers pride and directly north of mt belknap is a great field of phonolite nearly all of bilich is highly stained with iron oxide the locality yields beautiful specimens of nephritic phonolite several undeveloped but most promising veins are opened with short tunnels the decomposed filling pans gold in milling quantities in a general way the gold mountain faults dykes and veins trend towards that stupendous uplift represented by baldy and belknap and incidentally proves that the majority of the lodes are true fissures fissure il gash veins occupying as they do shrink age cracks in the cooled eruptive rock lade lack the regularity of strike so conspicuous lit the vein system of the major portion of tho mt baldy region it was intended 0 o outline the predominating format formations ions but lack of time at the last moment i prevented tho the map will however serve serve to illustrate the general topo gr |
