Show GEOLOGY OF MT BALDY ALDY ctr GOLD L P BELT bel BY J F GIBES GIBBS M a rosval e division f barring complex conditions caused by byi unusual limiting faulting along the foothills on tho the east cast and back into the mountains a distance of from three to td tour four miles the geology of tho the Marys valo division is easily read it is clearly evident that at some depth the entire range is with a broken and faulted substructure or of quartzite and that it may be credited to the devonian age A small area to the north of the gold run c canyon c nyon road presents some contradictory evidence the overlying limestone contains fossils credited to an earlier age than the i devonian its presence is an eibi enigma ma anti and cannot bo be discussed at this time the preponderance or of evidence is that the area now nov represented by the mt alt baldy range and its northern prolongation the mountains between millard and sevier counties was vas under tinder the ocean during the devonian age hundreds perhaps thousands of feet of sandstone was deposited tho the succeeding lower carboniferous period covered tho the sandstone with a thick lied bed of Ilin limestone estone at the close of the lower cai carboniferous boni ferous a gentle upward movement occurred and the area under tinder discussion rose above the surface of the ovean ocean where it reina remained ined during the enormous lapse of time that intervened between the closing centuries of the lower carboniferous and well along alint toward ii the close of the Tertia ray age when an al most worldwide world wide change of level occurred along the cast side of and parallel with what is now known as the mt baldy range and its northern prolongation the range the earths crust was fissured front from tile the surface down to the region of molten rock the fissuring was succeeded by faulting f and an idea of the tremendous displacement may bo be formed from the statement that doer deer trail peak the highest elevation of quartzite is fully feet hi higher her than the I 1 valley while the eastern section of the quartzite quart zito is burled buried beneath hundreds of feet of basalt and other eruptive material the displacement extended northerly a distance of nearly miles in sevier valley the sandstone so conspicuous along the enst side of the Pa livant mountains isan isbn ia on the cast saide of the valley burled buried under tinder hundred sper haps thousands of i 4 uon tion material this stupendous displace is known as the sevier fault in the vicinity of marysvale Marys vale a great fissure on oil the east paralleled the sevier fault and Is isnow now marked by a fringe of basaltic foothills and volcanic activity must have continued cyer al a long period after comparative quiet reigned along the mt baldy range the evidences of which are found in the mixture of volcanic bombs and debris in a belt of oolite bullion canyon represents a lateral fault extending westerly from thet the sevier fault the apex of the divide bet between two mile and bullion is ay quartzite and is fully 1500 feet 11 higher her than the quartzite quart zito to the north of bullion creek another area of stupendous displacement exists along the cottonwood fault where doer deer trail peal rises fully frilly 1000 feet above the quartzite quart zito on atheridge the ridge to the south of cottonwood the topographical and cross section maps to which the read readers er s attention is invited will servo serve to illustrate the profound northerly and southerly faulting 0 of the basic formation of the mt baldy range the teachings of 0 geology prove that the z K sd po rp h ME t qa R hiot it it v it e pit V DIN E 0 ecta ey L E inest one iv quartzite A it ka N V nix C P 0 x aj P K ele NO cl ay 1 11 1111 Z arx Q lr 42 FRAN slop nept Z A 05 0 alq a FO U R e R ti tw em ik jig fill rat A 14 A wo 4 et a vw 41 U N W sill A 9 61 ao 1 m 04 na 0 1 av tj A n I 1 N i um I 1 I 1 ka A 0 t M j I 1 I 1 I 1 t is 11 ol 01 T alp ilp MW a A an A I 1 pi r A CAS A Z ea I 1 d N 40 D u 4 K rqn mv as A NW 44 W 5 ca ZIN 1 e t all 4 av IV r A topographical MAP NT riT BALDY ston dynamical history of the region to tho the west and southwest of marysvale Marys vale is as follows A large area areal occupied by sandstone with a limestone capping because of the shrinkage of the earths molten interior or oi bo be cause of accumulation the of gases seeking lines of easement the crust was fissured and brolien broken en into enormous f fragments rag ments or blocks somo of the great masses maintained their position but the larger portion settled down into the yielding mass of underlying igneous matter from those yawning fissures enormous enor anor moun masses of and birdseye birds eye porphyry oozed up from the earths melted interior and formed mountain masses thousands of feet deep again tho the unstable crust quivered with intense seismic forces forcer the old and but partially 1 lie healed aled dounda were opened and new fissures formed in the overlying eruptive t mass and great dykes of highly lit gh ly mineralized erali zed porphyry now mark the location and direction of many of those ancient tents rents through the weight of the superimposed super imposed mass of eruptive material the associated 1 I 1 i ca t u 1 I hrna a 6 it stron solutions S ut ions the underlying sandstone was altered r cliant changed e d to the now la quartzite quartette there are several localities aher 0 the sandstone escaped those agencies agenole 3 and retains ity ito old time dine characteristics and insensibly inc merges rages into quartzite as it nears the igneous lor for tho the brief period of comparative quiet which succeeded the previous disturbances was broken by another uplift of tho the range and along the central portion extending froin gold mountain south a distance of sonic some ten miles a great fissure was formed from the surface down to the region of liquid fire the mighty force which split the northern noi thern portion coition or of the mt B aldy Baldy range also formed lateral fissures extending easterly and westerly ve sterly from the great central rent those fissures became lines of jasee easement for the vast mass of lilic magma seeking egress cress c ress and from molten depths the hot gaseous ageous mud flowed upward and formed great dykes of phonolite which to lay day elf cheerily eerily clinks under the feet of an occasional prospector while the eruption of the phonolite marks the last throes of na iia ture in the I 1 mt B baldy aldy region subsequent local fissuring fiss ming of the phonolite occurred and in connection with other fissures already a dy formed became channels lor for the up ward and lateral flow of gold and silver bearing so solutions lutious extinct craters fields of dark colored tra chite ridges of volcanic breccia dykes and chimneys of obsidian in the phonolite prove e that local volcanic forces were con tinned over a long period after the wide spread eruptive activity had ceased theare the readers aders attention is now nony direct directed el more particularly to the topographical and cross section maps while we hinves investigate ti dib the econ economical results of dynamical forces just described f to avoid confusion the great porphyry dykes only have lan tt eon mapped andt and the veins along the trend of those dykes aro an prominently drawn 1 the cross section shows the deer trail mine occupying a blau blanket ket contact which dips to the north at about eight or ten degrees gre es and is hidden by overlying debris in 4 that locality the owners have blocked about tons of ore having an average value of ten ben or twelve dollars per ton toil about feet distant to the south many carload car loadE a of ore were shipped and which netted ther the owners several hundred dollars per ton toil in lead silver and gold it is boll believed eved abat Y i the contact derived its filling by solutions ions from the north where eruption rock is in evidence and probably associated with a lateral later al fault the high grade ore to td the south doubtless owed its origin to a secondary 0 movement of solutions which passed through the large body of ore leached beached it ib V and transferred tho the concentrates to the higher her portion of the contact higher up on the deer trail escarpment is situ situated atod the lucky boy that years ao ago yielded a largo large quantity of high grade mercurial ore the origin of which is an unsolved problem still higher on the mountain side is sit bated the once f famous pluto uke like the lucky eoy boy it proved to io be a surface deposit in limestone the ore was almost pure silver L and with no visible reason for its presence in 11 a locality whore conditions are seemingly so unfavorable the first great porphyry dyke that ahat traverses almost the entire district occur 1 about three miles west from tho the mouth of cottonwood canyon and occupies the groat great northerly and southerly fault line aloner alona this dyke is situated tho the nelson a vein of gold bea bearing ring quartz that projects above them the ground like a great wall the branch vein is strong and its permanency man cilcy has been proven it yields silver anu and gold the standard ls is a monster lede ledge anil and yields lead silver and gold almost al in ost exclusively ex cl I 1 i in sulphide conditions on the north end 0 of the dyke is situated the copper belt to the west test of the crystal mine and trending northerly is a great dyke of porphyry that after traversing the marysvale Marys vale section bends northwesterly into the gold mountain district along this dyke is sit the brn n os high grade ore a and n d now has exposed a f cot ot vein th that a t averages 20 per pei ton ane 7 Is ia HW worked peo iq H and ought to develop into a bonanza down on the bullion creek side the dyke fol forms folins ins the hanging wall vall of the webster a monster onster ni vein with great 1 chutes ol of galena 0 ale and crystallized crystall zed lead carrying gold afia 0 0 C Y I 1 r cup i pluto I 1 ka rt phonolite t 9 ellort OJ R qu artiete artz Ete bootin Lo otin M fr 0 nt cott tr a I 1 silver space will not permit of any description of the corse l heaven and other fine properties along the great webster dyke another ni monster onster dyke cuts the country fr from om the cast side of mt delano over into bullion canyon there is ip a large number of fine alne properties pro on the dyke and contiguous ous to it A study of the maps will convince anyone at all fa familiar millar with the relation between geological conditions and the occurrence of wins and Tab values ions that the country to the west of presents one of the most inviting t 11 lows for ingoll intelligent gent investment to be found in hi the united states GOLD MOUNTAIN DIVISION alighting from abe 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 mat material orbil As one proceeds westward and enters clear creek canyon lie will note the fact that the gorge has been sloughed ploughed hed deep deegin in a bed of basalt which as ons ranch is approached becomes more coluin columnar in its structure the bed extends westerly from sevlar schlor station a i distance of some fourteen miles where rhyolite becomes the country rock and forms the apex of the tha range tho the earlier geological conditions of the mt alt baldy mineral belt are described inthe in the marysvale Marys vale Yale divis division lon of the subject and to the reader is re r the basalt extends some three to four miles north of the canyon and is also bounded by rh yorito and other eruptive rocks the upward climb from robinsons to gold mountain is among basaltic buttes weathered to fantastic shapes and high highly y color colored ed or discolored th through rou 13 gh the action of strong solutions the basalt extends to within a mile or so of gold mountain and to the stranger is a subject of curiosity interest and study in some localities loca liles lites the basalt caps tho the rhyolite but in a general way it merges so gradually into tho the rhyolite that no line of mar kation is visible i contemporary 0 with the great sevier fault and ami extending westerly the earths crust was profoundly br broken olcen or fissured along a line now represented by clear greek creek canyon and intersected and crossed by the great fracture which once extended fram fro m southwest of marysvale Marys vale along the present apex of the ran range go 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 rh the clear creek fracture reopened and basaltic material was forced up through tho the partially congealed rhyolite and which ox explains plains the blending of the line ot 01 contact Bo beginning ginning a short dis distance taace north of the f z 7 7 Z 7 aw 7 s TT T T ti 7 4 7 44 Z q K 4 locq ca pit 1 Z t 2 IL I 1 1 foj 44 t VI L at 5 k 1 V A A pit 4 4 P tra r t U I 1 i V 00 aw er C X 4 ap pp an A r 41 0 4 am 47 it 6 tta V S 9 ab CL 40 topographical OPO GRAPHICAL kapff t h aa 5 G DIVISI 0 W ja faa iw ja yaji ji y W 0 11 IT BA L D annie laurie see topographical maps map a belt of birdseye porphyry extends southerly a distance of a milo mile or 61 two and disappears under tho the more recent rocks to the east of the annio annie laurie an enormous belt comes in from mt alt belknap and forms the divide between kirn kim borly basin and the hend head of deer creek and is ia also so far as exposure is con conce cerand rend the cas t local boundary of the birdseye this peculiar porphyry with its darl dark felci baso with almost almog 4 al anti and spots extends westerly over the tiptop divide and down towards fish creek the lip dip of the magnificent annie laurie vein or veins is towards the west and on an that side at a distance of perhaps or t 0 00 teet feet from the crop droppings pings 0 is a dyke ot of porphyry entirely distinct from the country 1 variety the locality where the dyke is most prominently exposed is on oil the hillside to the southwest oy of the muc bird tunnel the tiptop divide is the apex of a lar largo a dyke of porphyry which occupies a northerly and southerly fissure or line of faulting tho the great sevier ledge with its marvelous wealth traverses this dyke on a southerly strike and upon which the tiptop and other bonanza claims are situated situate fl southwesterly from the tiptop the formation changes tho the birdseye bird soye porphyry on the surface at least gives ives way to rhyolite and ama tra chite faulting is more conspicuous and explosive volcanic activity more in evidence within this area and well in towards wa ads grand rand old baldy is situated the fine property prop city of the trappers pride the geology of the locality is given hy by a gentleman intimately associated with the mines and Js is as follows the country rock lock is altered to which has undergone a series of faulting and thereby tending to make it permeable to the action of mineralizing mineral izing solutions the faults so far as developments have determined determine are parallel with the veins thus far no lateral fa faulting tilting lias has been encountered to the east cast and southeast of the trappers pride and directly north of mt aft do bol knap is a great held of pho nolito nearly adlof all of bilich is highly stained with iron oxide the loc locality aliby yields beautiful spec specimens lInens of nephritic phonolite several undeveloped but most promising veins are aie opened with short tunnels the docompo decomposed cd filling pans gold in milling quantities in a general way the gold mountain faults dykes dyke and veins trend towards that stupendous uplift represented by baldy and belknap and incidentally proves that the |