Montana Gypsum Deposits— Rowe. 109 
TAg South Field. 
The productive part of this field is located wholly within 
Carbon county, and "this series of beds then extend south- 
ward into the Big Horn basin and can be traced into the 
mountains of Wyoming." 
There are three exceptionally fine outcrops in this field. 
At present only one of the three is being worked. The 
smallest or first outcrop of this field is located about eight 
miles south and east of Bridger and at this outcrop is 
located the only other gypsum plant in the state. The mill 
is much smaller, but similar, to the one near Armington. 
From ten to fifteen men are employed at the mill and in the 
mines, and the products, plaster of Paris and stucco, are 
hauled to Bridger from where it is shipped by rail to various 
points in the state. The annual output from this plant is 
very much smaller than at Armington. The mine is located 
nearly a half mile from the mill and the raw gypsum is 
hauled this distance also. The deposit that is being worked 
is from ten to twelve feet thick and is fairly pure gypsum. 
A tunnel (see cut) is run into fhe vein about 300 feet and 
the rock after being blasted down is hauled out by means of 
tram cars on ordinary steel rails. 
The beds dip a considerable to the northeast and form 
part of a beautiful anticline (see cut). Beneath the gypsum 
several feet, near the apex of the anticline, exceptionally 
good oil shale is found. 
This gypsum deposit has been worked for some time but 
owing to the distance from a railroad and the high price of 
teaming, it is not an extremely profitable undertaking. The 
refined gypsum products cost $4 per ton freight in shipping 
to any large cities of the state, and the material itself sells 
for about twice that figure. With high teaming rates and 
one-half of the selling price taken for freight no large profit 
is made on the material. However, it is paying a small 
dividend and the mill still continues to run. The altitude of 
this bed is about 4,200 feet. 
The second outcrop is between eight and ten (see 
sketch) miles from the first, and, while it has never been de- 
veloped to any great extent, it has been worked enough to 
show that it is much thicker and as free from interstratified 
