COAL DEVELOPMENT. 51 
The Carbonera mine has been in operation only two years (1906) 
and its output is used exclusively by the Uintah Railway Com- 
pany. The mine is situated on the hillside above West Salt Creek, 
at the little mining settlement of Carbonera, where there are a few 
cabins, a shop, etc. Good mountain water is hauled from Atchee 
and stored in a cistern. The entrance is on the outcrop and the main 
entry is about 600 feet long. The roof and floor are a firm sandy 
shale. About 5 feet of coal is mined. Two streaks of bone, from 1 
inch to 1 foot in thickness, are present, so that the coal is dirty. 
The daily production is reported to be about 14 tons throughout the 
year. 
The other mines and prospects in the area under consideration are 
small. They are all situated on the outcrop, and the workings at 
the largest are only a few hundred feet in extent. They are operated 
only during the winter months to supply the needs of near-by settlers. 
