Quartz Lodes 75 
Domingo continues westward for eight miles, as far as the 
savannahs near Libertad, and has been largely mined in the 
neighbourhood of that town, and between that point and 
Santo Domingo. Besides the working of the mines proper, 
some surface deposits, called by the Spaniards ‘“ Mantos,” 
are also worked for gold, especially in the neighbourhood of 
Libertad. The “ Mantos” consist of broken quartz, cover- 
ing the faces of the hills in the neighbourhood of some of the 
lodes. In some places they form a broken but regular 
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SECTION ACROSS SAN ANTONIO LODE 
A, Lode; B, Decomposed doleryte; C, Surface soil; 
D, Quartz rocks in surface soil. 
stratum over the whole side of a hill, and I was mnch puzzled 
at first to account for their origin.’ 
I have already mentioned that the lodes near their summit 
incline over towards the face of the hill through which they 
cut. In some cases, as in the San Antonio mine, the lode is 
in parts bent completely round, as shown in the annexed 
section. This bending over of the lodes is always towards 
the face of the hill, and is, I think, produced by successive 
small landslips. It is evident that if carried still further than 
in the case shown in the diagram, the lode would be brought 
down over the face of the hill, and the result has, I think, 
