Show GEOLOGY OF MT idt BALDY GOLD T I 1 N ELT 6 BY J F GIBBS marysvale Marys valc vale division barring complex conditions caused by unusual faulting along the foothills on the east and rd bade back into the mount mountains alfis a distance of from three to four miles the goo geo logy of the marysvale Marys vale dv division islon is easily read it is clearly evident that at some depth the entire range ranga is with a broken and faulted substructure of quartzite quartette and that it may be credited to the devonian age A small area to the north of the gold run canyon road presents some soine contradictory evidence the overlying limestone contains fossils credited to an earlier age than the devonian its presence is is an enigma and cannot be discussed at this time the preponderance of evidence is that the area now represented by the mt anit baldy range and nd its northern prolongation the mountains between millard and sevier counties was under the ocean during the devonian age hundreds perhaps thousands of feet of sandstone was deposited tile the succeeding lower carboniferous period covered the sandstone sands tono with a thick bed of limestone at the close of the lower carboniferous a gentle upward movement occurred and the area under tinder discussion rose above the surface of the ocean where it remained dur ing the enormous lapse of 0 time that inter between the closing centuries of the i lower carboniferous and well along towards tho the close of the Torti Tort laray aray age when an al most worldwide world wide change of level occurred along the east 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 from L the surface down to the region re ion of molten s i 1 i v rock the fissuring was succeeded by faulting and an all idea of the tremendous displacement V may inay be Q formed from the statement that i 1 l deer trail peak tho the highest elevation of quartzite is fully feet higher than the valley while the eastern section of the f quartzite is burled beneath hundreds of feet of basalt and other eruptive material the displacement exten extended led northerly a dist distance e of nearly miles in sevier valley the sandstone so conspicuous along the cast side of tho the Pa livant mountains dins is on the cast side of the valley burled buried under hun him deeds perhaps thousands of feet of crup lion ma material erial this stupendous displacement is known as the sevlar sevi er fault in the vicinity of Marys valo a great fissure on the east paralleled tho the sevier fault and is now marked by a fringe of oe basaltic fool foothills hills and volcanic activity must have continued over 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 the sevier fault tito the apex of the divide between two mile and abd bullion is quartzite and ana is fully 1500 feet hi hiher higher 0 her than the quartzite to the north of bullion creek another area of s stupendous tupen dofis displacement exists along the cottonwood fault where deer trail peak rises fully 1000 feet aboyo tho quartzite on the ridge to tho 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 baldy range the teachings of geology prove that tho the N corp h ra A P f A Z J lit R h yol I 1 te v V ey e Y 1161 IV lle stone Q ov quartzite ta 77 a a 1 1 mr t W to Y 14 P W AO ow al J k t f 6 I 1 i Z 9 c aza jo 1 lip flu bat q jt mitt ON ax A arx kil 1 3 W aalf adz I 1 v I 1 11 nv A I 1 ua X y 1 MR LV t 6 T U p 1 IA i 1 V dp M Q N aa 4 V EL av f 4 act cat 14 V RIAT 1 2 a paw aa 0 o MAP MINERAL BELT dynamical history of the region 7 to the fhe west and southwest of Marys valo is as follows A large area occupied by sandstone with a limestone capping because of the shrinkage go of the earths molten interior or because of the accumulation of gases seeking lines of easement casement the crust was fissured a and n broken into enormous fragments or blocks some of the great masses maintained their position but the larger portion settled down into the yielding mass of underlying lying igneous matter from those yawning fissures enormous masses of and birdseye birds eye porphyry oozed up tip from the earths melted interior and formed moun mountain talu masses thousands of feet deep again the unstable crust quivered with intense seismic forces the old and but partially part kIlly healed lich lei wounds were opened and now new fissures formed in the tho 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 imposed mass of eruptive material materi al the associated heat and presence of if strong solutions toe t N underlying sandstone was altered eh changed chau hinged ged to the now familiar quartzite there aro ara several localities where the sandstone escaped those agencies and retains its old time characteristics and insensibly merges into quartzite as it nears the igneous formations mat ions the brief period of comparative quiet which succeeded the previous disturbances was wag broken by another uplift of the range and along the central portion estlin extending ding from gold mountain south a distance of some ten miles a great fissure was formed from the surface down to the acl region adlon ol of liquid lire fire tito the mighty force which split the northern portion of the mt baldy range also formed lateral fissures extending easterly casterly and westerly from the great central rent those fissures became lines of easement for the vast mass of magnia magma seeking egress and from molten depths the hot gaseous mud glowed upward and formed great dykes of phonolite pho nolito which today cheerily clinks under the feet ol of an occasional prospector while the eruption of the phonolite marks the ahe last throes of na ture in the mt baldy region subsequent local fissuring fiss ming of the phonolite pho nolito occurred and in connection with other fissures al 01 ready leady formed became channels for the upward and lateral how flow of gold and ailyen bearing solutions extinct t 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 continued over a long period after the widespread eruptive activity had ceased the readers attention is now directed more particularly to the topographical and cross section 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 along the trend of those dykes are pr prominently eminently drawn the cross section shows the deer trail mine occupying a blanket contact which dips to the north at about eight or ten degrees gr ces and is hidden bidden by overlying debris in hii that locality the owners have blocked about tons of ore having an average value ot of ten or twelve dollars per ton about feet distant to the south many carloads q of f ore were shi shipped plied and which netted the owners several hundred dollars per ton itu in lead silver and gold it is believed that the contact derived its filling by solutions from the north where eruption rock is in evi evidence dence and probably associated with a 4 lateral fault the high grade ore to ahe 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 ibe higher portion of the contact higher up on the deer trail escarpment is situated the lucky boy that years ago t yielded a large quantity of high grade mercurial ore the origin of which is an un im solved problem still higher on oil the mountain side bide is sit bated the once famous pluto like the lucky boy improved it proved to be a surface deposit dell in limestone the ore was almost puro silt ver and with no visible reason for its presence in a locality where conditions are seemingly so BO 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 df gold bearing quartz that projects above the ground tike a great wall the branch vein is strong and its permanency in has been proven it yields silver anu ana gold the standard is a monster ledge and yields lead silver and gold almost excle f sheely in sulphide conditions on the north end odthe of the dyke is situated i the copper belt s to the west of the crystal mine and trending northerly is a great dyke of porphyry that after traversing ap the marysvale Marys vale section bonds bends northwest northwesterly eHy into the gold mountain district along this dyle dyke is sit n ila bradburm BrAd bum aroun a air id d grade ore and now has exposed a 15 foot vein that averages 20 per ton tile property is being worked corked by pittsburg people and ought to develop into a bonanza down on the bullion creek side the dyke forms the hanging wall of oe the webster a Md monster rister vein with great chutes of galena and crystallized load lead carrying gold and tho the basalt extends some three to tour four miles north of the can canyon yon and is also bounded by rhyolite and other eruptive rocks the upward climb from robinsons to gold Blount ain is among basaltic buttes wc weathered adhered to fantastic shapes and highly colored or discolored through the action of strong solutions the basalt extends to i 4 J 7 B I 1 rec aw alt anal i t e 1 Y i cross leellon IR q e il N from dation iv aca silver space will not permit of any description of tho the I horse heaven and other fine properties ioe along the great webster dyke another monster dyke cuts the country irom from the cast side of alt delano over into mullion bullion canyon there Is a large number of fine properties los on the dyke and contiguous dousto to it A study of the maps will convince anyone at a au 11 familiar with the relation between geological conditions and the occurrence of beins and values that the country to the west vest of marysvale Marys vale presents one of the most fields for intelligent investment to be found in the united states 0 GOLD MOUNTAIN DIVISION alighting from the train at sevier station on the R 0 W IL R R the observant traveler to gold mountain will notice that the rugged and broken foothills are composed of ba baltic material As one proceeds westward and enters clear creek canyon he will note within a mile or so of gold cold mountain and to the stranger is a subject of curiosity interest and study in some localizes loca lites the basalt caps the ahe rhyolite but in a general way it merges so gradually into the rhyolite that no line of demarcation mar cation kation is visible contemporary with the great sexier fault and extending westerly the earths crust was profoundly broken brohen or fissured along a line now represented by clear creek canyon and intersected and crossed by the great fracture which once extended irom from southwest of marysvale Marys vale along the present apex of tile the range through gold mountain and onward to the north into the range those principal fissures including annu ni merable erable par parallel allol fissures were openings for the upward flow of rhyolite and kindred eruptive material prior to the complete solidifying of the rhyolite 1 the clear creek fracture reopened and basaltic material was korcel up through the partially congealed rhy rhyolite clite and which explains the blending blendin of the line ot contact beginning a short distance north of the S Z ev Z T 4 r ai 7 T ar pao JJ k Z r X I 1 I 1 I 1 I 1 ak I 1 to 1 I V V 4 tris 1 JJ 0 u Z 90 tel i LY J A JW t ian Y S V A az A ell alp 0 topo AP V GOL DIVI N wu 1 LAM 0 beir uthe the tact fact that the gorge has been ploughed sloughed hed deep in a bed of basalt which as robinsons ranch is approached becomes more columnar in its structure the bed extends west from sevier station stat ionn a distance of some i fourteen miles where rhyolite becomes tile the 4 country rock and forms the apex of the range the earlier geological conditions of the mt alt baldy mineral belt are described in tile the marysvale Marys vale division of the subject and to abir h alie respectfully annie laurie see topographical map a belt of birdseye bird scye porphyry extends south erly a distance of a mile or two and disappears under the more recent phon olitte i rocks to the east of the annie laurie an enormous plino litle belt comes in from mt alt belknap and fornis forms the divide between kirn kim berly basin and the head of deer creek and is also so far as exposure is conce rend tile the east local boundary of the birdseye this peculiar porphyry with its daik base and crackled tHic Trac Med kled with almost alina J specks and spats extends westerly over the tiptop divide mid and down towards fish creek Th thedia the edip dip of the magnificent agulo laurie vein ein or veins is towards the west and on that side at a distance of perhaps or f feet cot from the droppings crop pings is a dyke oe por chyr entirely distinct from the country variety the loc locality aliby whore tho the dyko dyke is most prominently exposed Js is on tho the hillside to au fl the southwest of tho the blue bird tunnel the Tip tiptop toV divide is tho the apex oi of a margo marge dyke ot of porphyry which occupies a northerly and southerly fissure or line of f faulting aul ting tho the great sevier ledo led o with its marvelous maiv olous wealth traverses this dyko dyke on a southerly sout lierly strike and upon which tho the tiptop and other bonanza claims aro are situated southwesterly from tho tiptop tho the for J mation changes the birdseye bird porphyry on the surface at least gives way to rhyolite rhy olito and achito tr faulting is moro more conspicuous and explosive volcanic activity moro more in evidence within this area and well in towards grand old Bal baldy dyAs is situated the fine property propel ty of the trappers pride the geology of tile the locality is given by a gentleman intimately associated with biti the mines and is as follows tile tho country rock is altered which lias has undergone a series of faulting and thereby tending to mako make it por per deablo to tho the action of mineral mineralizing izing solutions the faults faulis so far as aa developments have determined aro parallel with the veins thus far no lateral faulting has boon been encountered to the east and southeast of tho trap pers pride and directly north of 0 mt alt knap is a great field of phonolite pho nolito nearly neaily J all of wiach is highly stained with iron oxide tho the locality yields beautiful specimens of phonolite Se several vertal undeveloped 4 but most promising veins vein are open opened edwith short tunnels tho the decomposed filling pans gold in milling quantities in a general way tho the gold mountain faults dykes and veins trend towards that stupendous uplift represented by baldy balay and Del belknap knap and incidentally proves that the majority of the lodes aro are truo true fissures gash veins occupying aa they do 1 shrink J age cracks in the cooled eruptive rock lack the regularity of strike so conspicuous in the vein system of the major portion of the mt baldy region h ast it was intended to outline the predominating formations but lack or of timo at y the last moment prevented tho the map aul wul vii however serve to illustrate the general tol topo 0 o graphy orthis of this region the B W V and H Div division islon it would |