MINEBK00961

• County: Jefferson
• Document: FROMSIC
• Suffix: A

TABLE TWO -- JEFFERSON COUNTY
Ralston S:
(Little Ralston) Subsidence pits and subsidence trough. A trough and a row of pits extend over a distance
f 350'
'
o
. The trough is 150
long, 40' wide, and 2'-10' deep, and is probably due to the
collapse of the
i
'
i
m
ne
s
nclined entry. The pits vary in width from 5'-40' and in depth
from 2'-10'.
Ralston Springs S:
(Ralston Creek) Subsidence pits. Three small pits each about 10' in diameter and 2'-3' deep; may mark the
i
li
nc
ne entry of the Ralston Springs Mine.
Subsidence pit. Poorly defined pit 10' in diameter and 3'-4' deep; may mark location of
sh
ft
f
hi
a
o
t
s mine.
Subsidence pit. Pit is 20'-30' across and 3'-4' deep; probably formed by collapse around
around shaft.
Z: Working two beds (reference 2)
Rocky Mountain S:
No. 2 Row of subsidence pits. Nine subsidence pits occur in a 600' long row between the Rocky
Mountain No. 1 and No. 2 Mines. One pit is 15' square and 4' deep and marks the collapse
around the main shaft of the Rocky Mountain No. 2. The other eight pits range in length
from 15' t
35'
'
'
o
, in width from 12
-30
, and in depth from 2'-6'. They represent collapse
over stopes.
Z: Reference 2 notes two coal beds were worked.
Rowe *: Inclined opening. Entry partially collapsed: present opening 4' wide by 3' high; goes
underground an unknown distance. No access deterrent but hidden by topography and away
from publ is roads.
Reclamation scheduled for Spring 1984 -- The ad it will be backfilled using graded-fill
technique. All disturbed areas will be revegetated.
Key to unique features symbols:
Reclamation and/or plans -- Table Two
lists hazard abatement work
+ Discrepancy between two sources
Z Multiple mining zones
* Mine opening information
S Subsidence features
F Mine fires
D Mine drainage
-20-