Arizona miner., 1866-08-08
EHRENBERG,S VIEWS.

Mir. Ebrenberg has began a series of letters in the Alta Caii6aia. descriptive of the Mines in this vicinity. We quote the follow ing concerning the Big Bug and Lynx Creek Districts. 0ftke former he says:
 "The veins, in part of this district at least, are large, distinct, and well-delined; in the other parts this is not the ca c, and have not yet come to any conclusion as to what | they are, as no work whatever has been done on them, and the containing rock is so decoms posed and stained with oxide of iron in ceF- tain parallel zones and masses, that it Is even whether they are veins at all they have some regularity nevertheless; and should this iron stain be caused by the decomposi- tion of pyrites tor sulphates) of iron, then there is hope of numerous extensive and last ing veins, as most all the croppings show gold It is however, possible that this rusty stain is caused by the decomposition of the horn blende in the sienite Cor diorite), which is the rock in which all these veins occur. In this ease, not much is to be hoped from this sec- ond series of veins. 1 expect, however, that a few Of these also will prove good and per mauent.
 Borger is working. First-Thc Galena Ioas, belonging to the first series. l. is T Assure, and fine looking, large vein, prospect ing and opening well. Eight men are at work here in two shafts, from which about seventy tons of ore have been taken up to date (shafts about fifteen feet deep only). The Gaiena is situated on the mountains about two miles north of the mill.
 Second.-The Big Bug, situated about ore half mile from tic mill, also on the mouu- tains, and on the boundary separating the at .,f ff.f ..f singular character are taken from this mine. which make me almost believe that much of this iron stain is occasioned by the decom- position of the homblende rock, and not by iron pyrites--at least not always. The shaft is some fifty feet deep, but has considerable water in ii, which prevented my examining it below at present. They are extracting ore from two small levels some three feet down. The lower wall is very firm, but the upper consists of a crumbling. heterogeneous mass of the same material and segregated masses of crystalized hornblende. The Assure in which the ore occurs varies in width from two to four feet, and the ores lie in the same in nests Of various sizes, showing by their relative po- sition, however, the probability that at one time they have formed continuous sheet
 The condition of the hanging wall and the whole combination UT character of the gangue CT vein mass make me think very favorable of this vein. The vein mass consists fist of the ores referred to, segretated masses of re- crystalized hornblende, decomposed country rock, with small and large fragments, at times of the latter, and quartz enveloped and blend ed with the former in very peculiar mix ture It is my opinion that considerable friction has been excited at some time on the walls, by which the upper has been shattered and broken, and that ia course Of time the whole mass has been re consolidated, and the intervals refilled by re-crys talization of horn bende, iron pyrites, etc. Even the ore is of this character, gold generally occurring in the vicinity of brown crystals of iron in the ad- mixture of hornblende and felspar. and in a deposite of carbonate and even sulphate of copper in small quantities. The vein can be traced for mile in a straight line, showing principally those flush walls of hoinbslende, with ore in some places. As the shaft was sunk in a ravine it is questionable whether the whole vein has been SO much shattered, or whether this was confined to the ravines solely.
 On the Big Pug slait must ere long be sunk through the firm lower wall, where there Is no odanger from caying, and drift run through the decomposed upper wall, to ascer
 taln DOtH tnc SAtcht ol tue uecoihpOelllon ana whether there are not other ore deposits con tained there, uhich Is Ueryhkely. At all events, the prospects warrant thorough examina- ton. About fifty tons of ore, some of it very rich, have been taken out this year
 Third-The Eugenia, not worked now, and water in the drift, which was commenced too low, or too near the creek. This is vein, consisting off iron pyrites, occurring in gan que of calcareous spar, Cor talc) with some quartz. Near the surface the iron is oxydizcd, and the gold can be extracted in the common way. The iron pyrites will require concen- tration and roasting. l can say nothing of this vein now, further than that it seemed to be of enormous size, and that it is, or can be, worked with great facility, being only one half mile from the mill, and on the same level. Only the surface ores will be available now, ! oi which there are great abundance.