356 Tlte Acton Copjfer Mines, 



stone, some angular and some rounded ; some of them 

 almost wholly calcareous and others largely silicious. 

 The sulphurets of copper run in parallel clouded streaks, 

 the clouded character being occasioned by the presence 

 of more or less silicious matter mingled with the steel- 

 grey and the purple of the two sulphurets 4 



5. Limestone 2 



6. Copper breccia or conglomerate of the same characters 



as before 4 



Y. Limestone 3 



8. Slate with traces of copper (green carbonate on the 



surface) , - 12 



9. Serpentine-like rock 14 



10. Slate with traces of copper (green carbonate on the 



surface) ._ 4 



11. Concealed to the limestone 25 



93 ft. 



" The thickness of fifteen feet given to the brecciated limestone 

 of JSTo. 3 is deduced from a horizontal measurement of ten yards 

 across the strike and a supposed slope of thirty degrees, which is 

 about the dip of the bed and of the strata where it can be made 

 out in the vicinity. But no clear indication of bedding is visible 

 in the body of the breccia, and as the excavation across it is yet 

 only two feet deep, it may hereafter be proved that by some ir- 

 regularity the slope is less than thirty degrees ; in that case the 

 thickness would have been reduced in proportion to the dim- 

 inution of the slope. If the slope should be eighteen degrees the 

 thickness will be ten feet. 



" The two breccia or conglomerate beds numbered 4 and 6 con- 

 tain the great body of the copper ore. On the strike these beds 

 are exposed for about eight yards to the south-west. There is then 

 an interruption by the presence of a wall of the serpentine-like rock, 

 which crosses the strike in the shape of a slender wedge coming 

 to a point north-westwardly and gradually spreading out into the 

 strata in an opposite direction. A farther quantity of copper 

 conglomerate, however, exists on the opposite side of the wedge 

 shaped wall. The condition of the rock to the north-east of the 

 cross-cut has not yet been sufficiently ascertained to give any 

 description of it except from an excavation at the distanje of 

 about forty-five yards. Here a mass of ore has been mined for 



