Daily Tombstone epitaph., 1886-03-07
OUR MINING DISTRICT.
Glance at some Prominent Features
 Of eu, Mia-raI Formation.

| Fu FOfmat1OEs
 The mineral belt or zone in this vicin-
 ity and mining district may be described
 as follows: The general direction of the
 ore bodies or mineral deposits are
 northeily and southerly, and most of
 them are found at or near iheNcontact of
 the limestone with porphyry. The ore
 bodies not being confined 10 the contact
 of the limestone, but extending into the
 mass and through cross joints and
 cleavage planes in different directions.
 Many of the Assures are filled with DOT. phyry, granite, etc., of no interest to. the
 miner, except so far as they produce disturbances of ore deposits. Of those
 metalferous bodies some are rich enough
 to pay for working, and some are not.
 The same vein is in one spot rich and
 in another poor. These variations, it is
 impossible to reduce to any general law,
 especially in the case of silver mines.
 It is said that Assure veins grow richer
 in depth. Experience shows that some veins are richer at the surface than at hundreds of feet in depth, whilst at other points on the same vein, although | poor at the surface they prove richer as they are sunk upon. The developed | mines in this district show that ore bodies run in what are termed chutes or chimneys and these chimneys are re. gular. Sometimes they dip 10 the north or south along the ledge, at other times nearly perpendicular; sometimes they are found in irregular detached bodies; sometimes large and sometimes small.
 It does not follow that a rich out. crop will be followed immediately in depth by a poor vein, or that poor outcrop vii. become at once rich, for the scale on which these alterations take place is and exceeds the knowledge of our best miners. Each particular vein, pr deposit, has its own peculiar charac- eristics, and it is only by careful, con 'tant care of the miner that the peculiar eatures Of his mine are known 10 him. The ores differ in character and location The disturbed position of the veins of { his district nearly double the cost Of mining, owing to the large amount oi ( lead work (cross-cuts and drilts) that ( lave to be run in order to find the posi- ion of the ore bodies. If
 The oldest mines in this camp, with r heir miles of drifts, are not fully pros- V 'ected, and it will take many years and r arge amount of money to do it; yet, the C igh grade of ore found in the mines, and he size of the ore chimneys, when struck, 'ill warrant this expense s
 The larger companies will continue t his development and are doing it now, q nd when the water is drained from the ower levels new ground will be opened i nd the real value of the ore bodies elow the permanent water-level will be h etermined. t
 From an examination of the ore g odies, at the lowest depth, in our mines S he indications show that the water has z cen raising and falling, and the effect of V his constant action, and the chemical t hange that has taken place, can only be a etermined when the ore IS reached What effect this filitering process has n ad can only be determined when the P armament water-level, or point, where u ne ores have been submerged all the t me, is reached. At the present time lls cannot be told