12 
BULLETIN 77, U. S. DEPARTMENT OF AGRICULTURE. 
ber used in the mines, and information concerning the life of the 
timber and the extent to which methods to prevent decay had been 
employed. A small part of the material included may have been used 
in structures above ground. 
Reports were requested from 823 operators, 110 of whom were 
coal-mine and 713 metal-mine operators. Out of 352 replies, 179 
(15 coal-mine and 164 metal-mine operators) reported that no timber 
was used during 1911, while 173 operators reported the use of timber 
on which the following statistics are based . 
In addition to the material reported by the tables, about 1,745 
cords (or 872,500 b. m.) were used for fuel. 
Nearly all the timber used came from within the State. About 
800,000 board feet was reported as coming from outside, mostly 
Douglas fir from Oregon, with a small amount of pine from New 
Mexico. 
The timbers for use hi the coal mines ranged in size from about 5 
to 7 inches in diameter and from 7 to 18 feet in length. In the 
metal mines 8 to 10 inch diameters were the principal sizes, though 
timbers varying from 6 to 20 inches were reported. Lagging was 
usually 3 to 4 inches at the small end, and mine ties were 4 by 4 or 
4 by 5 inches in section and from 36 inches in length in the metal 
mines to 54 inches in the coal mines. 
Table 5. — Amounts and values of mine timbers used in Colorado in 1905, based on 
reports of mine operators. 
Num- 
ber of 
mines. 
Total amounts. 
Total 
p-alues. 
Cost per 
Mb. m. 
Mines reporting. 
Round, 
M b. m. 
Sawed, 
M b. m. 
Round. 
Sawed. 
Round. 
Sawed. 
Coal mines 
69 
7,893 
18, 152 
457 
13,061 
$153. 152 
284, 861 
$15, 428 
251, 798 
$19.40 
15.69 
$33.76 
418 
19.28 
Total (all mines) 
487 
26,045 
13,518 
438,013 
267, 226 
16.82 
19.77 
Aggregate 
39,, 
)63Mb.m. 
S705 
,239 
Table 6. — Amounts and values of mine timbers used in Colorado in 1911, based on 
reports of mine operators. 
Num- 
ber of 
mines. 
Total amounts. 
Total values. 
Cost per M b. m. 
Mines reporting. 
Round, 
Mb. m. 
Sawed, 
Mb. m. 
Round. 
Sawed. 
Round. 
Sawed. 
Coal mines 
77 
187 
10,859 
6,601 
1,000 
6,406 
$307,372 
139, 030 
$20, 368 
141.185 
$28.20 
21.10 
$20. 37 
Metal mines 
22.00 
Total (all mines) 
264 
17,460 
7,406 
446,402 161,553 
25.50 
21.80 
24,866 
S607.955 
The amounts were reported in linear feet, in board feet (log scale), 
in cubic feet, and in cords. To reduce these various units to the 
