122 



SCIENCE PROGRESS 



planes (fig. 2). In such positions the schists have been crushed 

 and rendered permeable to solutions containing copper and iron 

 sulphates, with some gold and silver. The solutions no doubt 

 rose along the Great Mount Lyell fault, and were reduced by 



X X X X X X 

 X X X X X X 



xxx 

 x x x sx x 



• . / : * ? Schist 

 *• . • '. Outcrop 



I" * .* " • 1 

 ,. • • • ..-• 



Owen .; 



L 



Alluvial & Glacial Deposits. 



PCO^t^-I Silurian (? Ordoviclan) 



jj 



Devonian Conglomerates. 



Mount Lyell Schists. 



XXX 

 xxv 



Queen River Porphyrites. 



Great Mount Lyell Fault 

 •(F) Transverse, Faults 



Fig. i. — Sketch-map of the Mount Lyell Mining-Field. 



reactions with the decomposing chloritic and felsite material in 

 the crushed schists, masses of which were replaced by sulphides. 

 The Iron Blow was on the hanging-wall side of the pyritic 

 mass, and these two ore deposits were clearly connected in 

 origin. The hematite is not an ordinary gossan, or it would 



