Ti-rrarc l).v terrace this surface copper mining is destroyinj; a mountain from which 

 eventually will he extracted many thousands of tons of copper, probably a billion and a half 

 of pounds. The canvas shows the workings as they were in 1910 



which plow up the more or less shattered rock and diiinp it into trains of 

 ore-cars, which a^ain transfer it to the concentrators and smelters some 

 twenty miles away. The system of work consists in stripping off the surface, 

 which is practically barren of ore, in order to unco\er the ore bodies below, 

 the operations involving the construction of a series of ascending terraces 

 on which the process of mining or stripping is cf)ntinu(>d simultaneously, 

 with the highest always the most advanced in tlie work. 



The painting represents the state of the workings in the summer of 

 1910, and displays instructively the relations of the geological elements 

 to one another. The deserted diggings on the extreme left show terraces 

 carried around an amphitheatre-like exca\ation through shattered rock 

 containing the iron and copper o.xides, and the commingling stains indicate 

 the confused association. The center of the painting shows the broad con- 

 vex breast of the hill which is the present focus of mining acti\ity. The 

 terraces rise seven stories with an equipment of cars, steam shovels and 

 miners, and show distinctly the yellow stripping representing barren surface 

 material to be carried by cars to the wash dumps, and the grayish white 

 exposures underneath constituting the ore bodies to be mined with steam 

 shovels and .sent to the concentrator at McGill about twenty-two miles 

 away. The train of cars on the extreme right is loaded with the crushed 

 ore, described as looking like "crusted sugar," and the tracks lead away to 

 th(> smelters. 



