Arizona republican., 1899-06-26
DEEP MINING IN ARIZONA.

Early in the history of mining h
 Arizona, the opinion was Tormed Dy
 the prospectOrs that ''the veins dld nol
 go down" This idea has c0n1nuei to
 s1revail to a greater or less extent un-
 til lately, and s still held by many l
 have also heard it expressed by mel
 who have done much prospecting and
 mining in other sections of the Pacific
 states. This idea, of course, pert2ined
 altogether to Assure veins, and has
 been applied to that class Of veins,
 without regard or reference to the
 enclosing rocks; nor have any a!gu-
 nents been advanced to explain why it
 should be different from any oshsr
 mining sections. The prevalence of
 this oTiniCn has very often worked to
 the detriment of the mining interas s,
 especially in the Bradshaw raEg5; the
 average sInallnesS or narrowness of
 the veins has also been referred to.
 The first question, naturally, to be
 asked, is Did you go down to ses?' The answer to this, proven by z the thousands of holes one finds, IS No 9
 The prospector, when he finds vein,
 hunts along it to find a pay streak, and if he does not find one, abaldons 1t. He may find 9 rich spot. and if So
 goes at Cncs to work. If it pinches on him. he soon gives it up and says, The vein played out; 1t did not go down" At most, his work reaches the limit of a windlass, unless particularly rich. On the hundreds, 1 might say thou sands, of holes that I have seen, there may have been, possibly, twenty whims erected by prOspactors.
 Very Often these works have been in tunnels, and extending some hun dreds of feet, but that does not count fn the argument that the veins do not go down Some will say that the veins do not hold their value in depth. The proofs of th.s are based upon no better arguments than those given above. Work done in late yeaTs-say the last five or skin the deeper mines, goes to prove the contrary of this proposition, and that in a very marked degree Of this we have many examples, though we cannot be said to have any examples of deep min.ng.
 In the Congress the inclined shaft has reached a depth of about 1,800 fest but the vein is So fiat that the perpen- dieular depth from the surface is Only about roo feet. The Crowned King has shaft 800 feet decp below the tunnel level; the deepest back over the tunnel being about 1000 feet The McCabe and Little Jessie in the Chap arral dsstrico are each 600 feet below the collar of the shaft The Senator is GOO feet from the crop to the crosscut tunnel. The Gladiator is 600 feet from the crop to the crosscut tunnel leTsl, and shaft sunk 100 feet below that level. These are the deep mines of Yavapai county.
 Let US now consider each of these cagss. In the Congress we find that r1R 1,.o C1 .,11 values have not decreased i1 depth. The utter inability to extract the val Ucs at the start caused this property 10 rema.n idle for about twenty years, and until the present owners took hold of it. Upon reaching a depth of be- tween 100 and 200 feet the vein dis appeared, being iGteTsected by a dyke, but on passing through that CbstrCc- ton they found the vein again in i place. Had it not been for persever- i sl1f-eeee -thes- th $ -m.Ge might have been quo,- i ed as a pSoOf that ''the vein did not {. go down" >~
 On the Crowned King they worked ! to tunnel level on $10 free gold per 1 ton, with some concentrates Ih-s has { increased with depth 10 an average Of | $40 per ton, about one-half of it being { free gold. Some pockets have yielded | ore going into the tens of thousands in i value: besides, the average width Of | the vein has increased. At the Mo I Cabe' the vein has shown a s-eady in ! crease in width. and maintained the | values, possibly a small increase n ! value of ore. ~-'cfs9F -7to
 At the Little Jessie the assorted ore i WIS rich at the start and has produced the same quality 70 the bottom of the mine The nature of the deposit is peculiar, and the work has been prose cuted more n the manner of search for the rich pockets. the great body of the deposit being left still standing. I On the Senator the best shoot Of ore was at the top, but the richest org has been found near the bottom. Tn the GIada7tor the quality and value has with depth, particularly be- Low the tunnel level. To this list might be added the Belle and Poland. 400 feet deep and the Favorite, o3 Lynx creek. 900 feet deep.
 I know of no instance where 'the i vo- has played out and therefore hold that there s not 3 particle Of proof of the statement made at the b2- ginning of this article. h this list you have ores of nearly every variety except silver ores. It is very easy to start an opinion. but It takes some time to contradict it.-JOhn. r Blan1y in Engineering and Mining Journal