Show aa aa aaa eve ec s vee f STATELINE DISTRICT IN MON jl S er stateline Stat eline mining district says a special correspondent ot of the mining and scientific press is located in the southwestern part of utah in iron county close to the nevada line some of the claims extending into nevada the mines were discovered six years abo ago and many claims were located the mines are situated sixteen miles from modena a station on the oregon short line railroad and are at an altitude of feet the wagon road from f rom the railroad is good and the mines are easy of access lying for the most part on low wooded hills the climate is favorable and work may be carried on throughout the year wood is good and plentiful the best nut pine being delivered for from to per cord depending upon the situation of the mine there are two small streams of water in the district enough for milling purposes on a moderate scale water is being encountered in some of the deeper opened mines notably the johnn johnny y and while there is no dan danger daner er of water in excess the johnny and the margaret will probably have to pump from their shafts sufficient water for mill ling purposes the ores with the notable exception of those from the ophir mine are what are generally described as free milling carrying gold and silver associated with a small percentage of iron in several minerals and a small percentage of mac mackanese macanese mag anese the milling with the exception of the ophir which has adopted a leaching 1 process will require breakers stamps plate amalgamation and concentration by means of tables the cost of milling in a 20 stamp mill should be less than per ton and should save about 90 percent per cent of the values with some of the richer ores it may be profitable to cyanide the tai tailings linas the mines are found in the quartz veins in a great dyke which is made up of a sion of flows and intrusions of various eruptive masses which go by the name of purphy t ries this dyke is a mile wide and several everal miles long and is highly mineralized the main and underlying mass is a hard iron stained quartz porphyry or rhyolite similar to the formation in which the bodie cat cal mines were found and not unlike the hanging wall at the surface of the comstock lode in nevada the other overlying and intrusive masses are of various colors from white to gray and green and are less and more the veins often carry considerable as at cripple creek colo though the is seldom gold bearing be arina black oxide of manganese is found in in nearly all of the veins and occurs in greatest abundance in the ore shoots the country rock which may be described as porphyry now occupies what was probably the vent from which flowed the great sheets of andesite and other like erupt ives including 0 tuffs and brec cias clas which cover the country to the eastward for miles there are no sedimentary rocks in the district nor to the east of it but a non mineralized limestone belt lies only a few miles to the west the range north and south is made up of erupt ives the underlying quartz porphyry in which most of the veins have peen formed appears to have been little eroded in almost all cases the richest rock occurs some distance below the surface and there is no placer er gold worth mentioning in the gul gulches chea suggesting that no extensive ore bodies have been eroded the main lines of fracture in the porphyry extend northerly and southerly and nearly all of the veins in the district have been formed in north and south fissures these veins vary from mere stringers to thirty feet in width and upon them are located nearly all of the mines of the district notable among them being the utah spur willowvale willowdale Willow vale sunflower gold belt burro creole and jumbo all of these mines seem to have considerable quantities of good ore the north and south veins as a rule have good walls and are strong strona and continuous the ore occurring occurring in in well defined shoots the notable exception to the rule of northerly and southerly veins is the blo big east and west vein upon which the three principal mines of the district are located namely the ophir the margaret and the johnn johnny y it is presumed that these three mines are on the lame iame fissure because they are nearly in line and together because of local similarities and because no other east and west fissure is 1 found in the vio io mity connection underground has not b been een made however and the droppings crop pings for hundreds of feet at times are covered W with alth slide and wash there is a known faultier faulting of the vein between the johnny and the Marr margaret aret workings and there is probably ably another between the margaret and the ophir this fissure having broken across the main line of fracture is character teed by irregular walls particularly in the johnny and in the margaret and at times in those mines by no means distinct walls much of the ore being a replacement of country rock and gradually fading into it like the ore deposits at cripple creek colo another striking feature of the east and west vein is the presence of silver the north and south veins as a rule carry but little silver while in the east and west vein the silver values commonly equal the gold values this is true of the margaret maraaret though in the ophir lying to the we west st the silver values predominate while in the th e johnny on the east the gold values are in excess the vein filling is always quartz with more or less Q ilici fled fied and decomposed country rock the main values lie in the quartz though the walls are always more or less mineral mineralized i zed at times the partly replaced country rock in the veins is very rich in the johnny and in the mar garet some of the richest ore is found about enclosures of country rock in the quartz i 1 the ore of tb district may be called lov i gra grade de and musi be milled on the gl ground und very rich samples may be taken from almost any vein and in a few mines there are large shoots from which some lots of ore running ru nin r from to 2000 per ton has been an and may be sorted and shipped but most of the higher grade ores would be milled with the I 1 other ores owing to transportation and treatment charges the east and west vein is some somewhat arregu irregular lar in width varying from four to fifteen feet and the best ore occurs in fairly well defined shoots which seem to make at or near intersections with north and south veins the ophir has so far developed one very large ore shoot about feet long from five to ten feet thick and ex extending from the surface to the foot level the ophir shaft is now feet deep and drifts from this point to the ore shoots are now being run some of this ore is very rich and meyeral hundred tons averaging about per ton have been shipped to the smelters shelters sm elters another known shoot exists in ophir ground east of the big shoot and probably there are ot others hers but the vein has not beeh explored far east of the shaft and the droppings crop pings are in the main covered with debris the ophir has just completed a ton mill at a cost of the johnny has so far developed three large ore shoots some small lots of ore shipped to the smelters shelters sm elters bringing over per 11 1 1 ton and much of it over 2000 per ton this mine has produced about in the past two years the shaft is feet deep and no drifting has been done below the foot level the owners are developing the mine 0 now and will build a large mill next summer at ac present they are sinking the main shaft which is in good ore and are drifting through a rich shoot of ore on the foot level at a point feet east of the shaft the margaret has thus far developed but one of its known ore shoots this shoot 1 crops along the surface for feet and is from three to eight feet in width and averages averages 8 per ton though 0 much of it will run from 12 to 15 per ton it was cut at the 60 foot level and drifted upon east and west for fifty feet and a full face of ore is exposed in the face of each drift the average value excluding 1 ng the high grade ore being about 10 per ton mixed with the mill milling inar ore at tb this is level was found considerable rich ore running from 50 to per ton within a few weeks the same ore shoot will be opened up in the crosscut on the foot level another ore shoot lies west of the shaft but it is undeveloped as yet it extends for over feet on the strike of the vein and averages more than four feet wide the droppings crop pings q run from 1 to 20 10 per ton the company is is now sinking a vertical double compartment working shaft which at the foot level will inter intersect s act the east ore shoot at a point feet below its apex from this level a drift will be extended west under the west ore shoot schoot for its entire length the gold in the richest Maro margaret aret ore seems to occur in the form of a telluride since e the above was published the ore body in the margaret has been opened up on the f oot foot lei el it Is more than four feet in width and carries avenire aver sige values of from W 10 to 25 5 in gold and silver to the ton |