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UNIVERSITY of ILLINOIS. 
Geoloyy of Muting Camp in New Ife.rico. — llerrick. ^1^1 
altered, forms a lead mining region, including the famous 
Kelly camp with the Kelly and Graphic mines, which have 
produced a number of independent fortunes, as well as a large 
number of properties of less importance. The southern part 
of the range, on the other hand, is essentially a gold district, 
which, although still awaiting development, promises to be of 
substantial importance, as in Water Caiion, Six Mile Canon 
and others. 
The conditions at the north end of the range are apparent- 
ly simple (plate xiii). An extensive uplift between the So- 
corro mountains and the present site of the Magdalenas has 
sutfered erosion, leaving the western base as the present 
range. The three or four hundred feet of the upper series, 
(consisting of limestone and sandstone in alternating laj'^ers 
has been tilted to an angle of 45^, exposing on the eastern 
slope several hundred feet of the altered acid series beneath. 
This series has here been transformed into a granite with 
only here and there a thin band of lime to indicate the origi- 
nal stratified condition. 
Dykes of quartz intersect this series at intervals and are 
occasionally mineralized, but, as in the case of acid intrusives 
in acid country rock elsewhere, the concentration is appa- 
rently never sutlicient to warrant exploration. 
No very definite estimate can be made of the thickness of 
this lower series, for it has been too completely fused to re- 
tain any adequate data. It is frequently penetrated by bands 
of schist and dykes of diorite, but its upper layers retain a 
schistose or gneissoid character, and where they approach 
contact with the limestones become quartzites. 
The contact of the quartzite with the lime is everywhere in 
evidence along the eastern face of the axis of the range in its 
northern portions and lies all the way from a few feet to two 
or three hundred from the summit, and is capped by one or 
more of the lower lime belts. The contact is apparently only 
irregularly conformable or the original conformity has been 
disturbed by more or less extensive interpenetration or solution 
along the lower contact. This contact is usually mineralized 
and forms the outcrop upon which many exploratory workings 
and a few producing mines have been placed. 
