============================================================
1 | 2 | 3 |
-----------------------------+--------+--------------------+
| | |
| | |
Type of excavation. |Tunnels.| Worked from: |
| | |
| | |
-----------------------------+--------+--------------------+
Full-sized single tunnel | B | 1st Ave. shaft. |
| | |
Full-sized single tunnel | A | 1st Ave. shaft. |
| | |
Full-sized twin tunnel |A and B | 1st Ave. shaft. |
| | |
| | |
| | |
Full-sized twin tunnel |A and B |Intermediate shaft. |
| | (West of shaft.) |
| | |
| | |
Full-sized twin tunnel |A and B |Intermediate shaft. |
| | (East of shaft.) |
| | |
| | |
Full-sized twin tunnel |A and B |Intermediate shaft. |
| | (East of shaft.) |
| | |
| | |
Exploration drift |A and B |Intermediate shaft. |
| | (West of shaft.) |
| | |
Twin tunnel. Enlargement |A and B | West shaft. |
of exploration drift | | (East of shaft.) |
=============================+========+=====================
======================================================================
4 | 5 | 6 | 7 |
----------------------------------+--------+------------+------------+
| | Length | Average |
DATES. | Time | tunnel | advance |
----------------------------------|elapsed,| excavated, | per day, |
| | in | in | in |
From | To | days. |linear feet.|linear feet.|
----------------------------------+--------+------------+------------+
Feb. 28, 1906. |May 12, 1906. | 74 | 346 | 4.7 |
| | | | |
Feb. 28, 1906. |Apr. 30, 1906. | 62 | 255 | 4.1 |
| | | | |
Aug. 23, 1906. |Jan. 5, 1907. | 136 | 789 | 5.8 |
| | | | |
| | | | |
| | | | |
Apr. 4, 1906. |Oct. 31, 1906. | 210 | 730 | 3.5 |
| | | | |
| | | | |
| | | | |
Apr. 4, 1906. |Oct. 31, 1906. | 210 | 783 | 3.7 |
| | | | |
| | | | |
| | | | |
Nov. 1, 1906. |Dec. 26, 1906. | 56 | 311 | 5.5 |
| | | | |
| | | | |
| | | | |
Mar. 1, 1907. |July 23, 1907. | 145 | 947 | 6.5 |
| | | | |
| | | | |
Sept. 6, 1907. |Dec. 4, 1907. | 89 | 603 | 6.8 |
| | | | |
===============+==================+========+============+=============
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8
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Methods and conditions.
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Top heading and bench. Muck loaded by hand.
" " " " " " " "
Top full-width heading and bench. Muck loaded
by steam shovel. Working exclusively on this
heading.
Top center heading and bench. Muck loaded by
steam shovel. Working alternately in headings
east and west of the shaft.
Top center heading and bench. Muck loaded by
steam shovel. Working alternately in headings
east and west of the shaft.
Top full-width heading and bench. Muck loaded
by steam shovel working exclusively on this
heading.
Exploration drift about 9 ft. by 12 ft. Mucking
by hand. Fourteen timber bents were placed in
March, and seven in April, 1907.
Drift excavated to full width and bench. Muck
loaded by steam shovel.
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