Wisconsin and Missouri Lead Region. 69 
the expense of cutting and burning. Oak, elm, buttonwood, hick- 
ory, maple, cedar, cherry, &c. are plenty. The oak is princi- 
pally white oak and post oak ; locust and maghorty trees som 
wild, and the latter bear good fait 
As to the nature of the ore, its origin, by a right idea of oes 
some judgment may be formed of its probable continuance, it 
seems that the crevices or fissures which the workmen deseribe 
as occurring in their diggings have served as passage w 
through which the ore has been projected from below, either in 
a melted state or in a state of sublimation, or by more slowly 
acting electrical causes; and that near the surface on the line of 
fissures, (which is likely to be nearly the line of contact of the 
two rocks,) the ore has found favorable circumstances to spread 
and deposit itself; and further, that these same circumstances 
may be expected to be renewed at different depths, and the ore 
there found in lateral.injections between the limestone strata, 
in veins and in the main fissures themselves. Veins of calc 
spar are of frequent occurrence in these rocks, and one in partic- 
ular was discovered some years since in the red rock not far from 
the present copper diggings, of uncommon thickness. 
also accompany the better developed copper ore veins in the pri- 
mary rocks on Lake Superior and in other parts of the world; 
and Dr. Houghton has remarked of them, that they pass into: 
veins of copper ore, and veins of copper ore may be traced. pets 
different changes till they become veins of cale spar. 
Copper ore as well as lead ore igeoknninedh:tcsennb.syeual haAbine 
formation in England. 'The deepest mine in that country is the 
Eaton copper mine in Staffordshire, the shaft being ieaphantingd 
and seventy two yards deep in the mountain limestone. | 
One of the other localities to which I have referred, as contain- 
ing indications of veins of copper ore, is on the other side of 
Jack’s Fork, connected with this same red rock ridge, not two 
miles from the old diggings. ‘The limestone and the red rock 
are both well exposed, excepting just at the point of contact ; 
they both manifest the same variety of changes as they approach 
each other that they do at the old diggings—the same porphy- 
ritic appearance of the quartz rock, the same breccia that there 
filled the rotten vein is here noticed, and small pieces of carbo- 
nate of copper have been dug up from a hole only four feet deep. 
But there seems no probability of here finding a large deposit of 
surface ore. : 
