============================================================
1 | 2 | 3 |
-----------------------------+--------+--------------------+
| | |
| | |
Type of excavation. |Tunnels.| Worked from: |
| | |
| | |
-----------------------------+--------+--------------------+
Full-sized single tunnel | C | 1st Ave. shaft. |
| | |
Full-sized single tunnel | D | 1st Ave. shaft. |
| | |
Full-sized twin tunnel |C and D | 1st Ave. shaft. |
| | |
| | |
| | |
Narrowed twin tunnel | C |Intermediate shaft. |
| | (East of shaft.) |
| | |
| | |
Narrowed twin tunnel | C |Intermediate shaft. |
| | (East of shaft.) |
| | |
| | |
| | |
| | |
Full-sized twin tunnel |C and D |Intermediate shaft. |
| | (West of shaft.) |
| | |
Exploration drift |C and D |Intermediate shaft. |
| | (West of shaft.) |
| | |
Twin tunnel. Enlargement }|C and D |{ Eastward from |
of exploration drift }| |{ open cut. |
| | |
Twin tunnel. Enlargement }|C and D |{ Eastward from |
of exploration drift }| |{ open cut. |
| | |
=============================+========+=====================
==================================+========+============+=============
4 | 5 | 6 | 7 |
----------------------------------+--------+------------+------------+
| | Length | Average |
DATES. | Time | tunnel | advance |
----------------------------------|elapsed,| excavated, | per day, |
| | in | in | in |
From | To | days. |linear feet.|linear feet.|
----------------------------------+--------+------------+------------+
Jan. 25, 1906.|Apr. 30, 1906. | 95 | 367 | 3.9 |
| | | | |
Jan. 27, 1906.|Apr. 30, 1906. | 93 | 354 | 3.8 |
| | | | |
{May. 22, 1906.|July 24, 1906.[E]}| 173 | 810 | 4.7 |
{Aug. 11, 1906.|Nov. 29, 1906. }| | | |
| | | | |
| | | | |
Mar. 19, 1906.|May 28, 1906. | 70 | 58 | 0.8 |
| | | | |
| | | | |
| | | | |
{May 29, 1906.|July 3, 1906.[E]}| 208 | 1,206 | 5.8 |
{July 18, 1906.|July 31, 1906. }| | | |
{Aug. 12, 1906.|Nov. 23, 1906. }| | | |
{Jan. 15, 1907.|Feb. 5, 1907. }| | | |
{Feb. 17, 1907.|Mar. 21, 1907. }| | | |
| | | | |
Dec. 1, 1905.|May. 10, 1906. | 161 | 225 | 1.4 |
| | | | |
| | | | |
Feb. 1, 1907.|Sept.13, 1907. | 225 | 1,033 | 4.6 |
| | | | |
| | | | |
}Feb. 1, 1908.|Feb. 14, 1908. | 14 | 65 | 4.6 |
} | | | | |
| | | | |
}Feb. 15, 1908.|Apr. 14, 1908. | 59 | 524 | 8.9 |
} | | | | |
| | | | |
======================================================================
[Footnote E: Time and distance omitted while working
through timbered stretches.]
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8
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Methods and conditions.
-------------------------------------------------------
Top heading and bench. Muck loaded by hand.
" " " " " " " "
Double heading and bench. Muck loaded by steam
shovel. Stretches aggregating 200 ft. narrowed
to about 25 ft. and later enlarged are included.
Excavation about 30 ft. wide. Top full-width heading
and bench. Muck loaded by hand. Steam shovel
not installed.
Excavation about 30 to 35 ft. wide. Top full-width
by hand and part by steam shovel.
Double heading and bench. Part of the muck handled
by hand and part by steam shovel.
Exploration drift about 10 ft. by 13 in. Muck loaded by
hand. 14 ft. timbered.
At portal of twin tunnels. Drift excavated to full
width and bench. Muck loaded by hand. 12 ft.
timbered.
Drift excavated to full width and bench. Muck loaded
by steam shovel. Full-width tunnel timbered for 26
ft. independently of the main excavation.
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