ft.) |
| | |
| | |
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. }| | | |
| | | | |
|