452 Macfarlane on the Acton Copper Mine, 



fethom, and $9.'72 per ton of ore. The thickness of the bed 

 at this point was 16 J feet, = 2| fathoras. Consequently a 

 square fathom of the bed contained 6.54 tons of 12 per cent 

 ore, and cost $26.73. The limestone in No. 5 shaft gene- 

 rally maintained a dip of from 70° to 80°, and the character 

 of the ore was principally that described by Sir W. E. Logan, as 

 above quoted. The richest specimen assayed from this shaft 

 contained 41.2 per cent copper, and 19.2 per cent of silicious 

 matter. It was not altogether free from limestone. The strike 

 of the bed of limestone from shaft No. 4. to No. 5. is N. 

 34°. E. Friction grooves have been observed at the junction of 

 both the foot and the hanging shale with the limestone. These 

 generally dip to the west at an angle of about 50°. In August 

 and September, No. 5 shaft was further sunk fifeeen feet, thus 

 reaching a depth of ninety-one feet. The ground between the 

 shaft and the fault above noticed was also stoped out. It was 

 poorer than that previously excavated, but the thickness of the 

 bed increased to twenty-four feet. 



Immediately to the west of Flowers's pit, there appears to exist 

 one or more powerful faults, which have thrown the cupriferous 

 limestone 140 feet to the right hand. These are indicated on the 

 map, from which it will be seen that the principal one has a di- 

 rection of about east and west, and comes in at the east end of 

 Harvey's pit, where the evidences of the existence of this right 

 hand throw are very striking. It is worthy of remark, that a 

 great accumulation of rich ore was excavated from Flowers's pit, 

 at the point where this fault intersected the one described as oc- 

 curring in the drift to the west of No. 5 ; traces of this are also 

 be found on the surface. These faults, the existence of which 

 was, I believe, first pointed out by Principal Davvsou, will doubt- 

 less be found to influence considerably the ore-bearing qualities of 

 the limestone bed. 



Harvey's pit is the next open working to the west of Flowers's 

 pit. On the surface it has a length of one hundred, and a breath 

 of eighty feet. A section of the working, at right angles to the 

 direction of the strike, is given on the next page ; from which it will 

 be seen that the same relations exist here as in Flowers's pit, so far 

 as the architecture of the limestone and the underlying shale is con- 

 cerned. The same contraction in the thickness of the limestone is 



