Report on the Geology and Topography of a Portion of the Lake Superior Land District in the State of Michigan: Copper landsHouse of Reps, 1850 |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
adit afford amygdaloid appearance bands bearing north belt bluffs boulders calc-spar Carp river chlorite clay cliffs coast compact trap Company composed conglomerate containing Copper Harbor crystalline depth distance district drift deposites east elevation epidote excavated explorations extended fissures gangue geological granite greenstone Harbor height hills hornblende hundred feet igneous rocks inches intersect iron island Isle Royale Keweenaw Point lake shore Lake Superior limestone lode mass metal Michigan miles mineral mines Montreal river mountains native copper nearly northeast northern northwest numerous observed occur Ontonagon river pebbles places Porcupine mountains porphyry Portage lake portion prehnite quarter of section quartz range 32 region ridge rises sand sandstone Saut seam seen shaft silver slope southeast southern southwest strata stratification stream striæ sulphuret summit surface terraces thickness tons township 58 traced trap range trappean rocks traversed vein veinstone vicinity width
Δημοφιλή αποσπάσματα
Σελίδα 9 - THE groves were God's first temples. Ere man learned To hew the shaft, and lay the architrave. And spread the roof above them, — ere he framed The lofty vault, to gather and roll back The sound of anthems ; in the darkling wood, Amidst the cool and silence, he knelt down, And offered to the Mightiest solemn thanks And supplication.
Σελίδα 159 - He saw numerous evidences to convince him. that this was an artificial excavation, and at a subsequent day, with the assistance of two or three men, proceeded to explore it. In clearing out the rubbish they found numerous stone hammers, showing plainly that they were the mining implements of a rude race. At the bottom of the excavation they found a vein with ragged projections of copper, which the ancie"nt miners had not detached.
Σελίδα 125 - It is on the rivers, and the boatman may repose on his oars; it is on highways, and begins to exert itself along the courses of land conveyance; it is at the bottom of mines, a thousand feet below the earth's surface; it is in the mill, and in the workshops of the trades. It rows, it pumps, it excavates, it carries, it draws, it lifte, it hammers, it spins, it weaves, it prints.
Σελίδα 15 - And be it further enacted, That the Secretary of the Treasury shall cause a geological examination and survey of the lands embraced in said district to be made and reported to the Commissioner of the General Land Office. And the President is hereby authorized to cause such of said lands as may contain copper, lead, or other valuable ores, to be exposed to sale, giving six months...
Σελίδα 159 - The earth was so packed around the copper as to give it a firm support. The ancient miners had evidently raised it about five feet and then abandoned the work as too laborous. They had taken off every projecting point which was accessible, so that the exposed surface was smooth.
Σελίδα 187 - It is difficult to determine its average thickness, from the fact that, in many places where it is highly developed, it sinks below the waters of the lake, and in other cases, where its base is visible, its top has been partly washed away. There are, however, some places (for example, at the western portion of the Grand Sable) where it...
Σελίδα 128 - ... fortunate circumstance, not only to the company, but to the whole mining interest on Lake Superior. It gave encouragement to those engaged in these pursuits, and induced them to persevere. It also demonstrated the true source from which the loose masses occasionally found on the lake shore had been derived. It demolished the fanciful theory advanced by at least one geologist as to the transport of the...
Σελίδα 11 - Syrens, having long hair reaching to the waist, and one of the savages asserted that he had actually seen such a being. At any rate, this extraordinary voice produced such fear that one of them died before landing ; shortly after, two others died, and one alone reached home, who, after having related what had happened, also died. Since that time, the savages have not dared to visit the Island, or even to steer in that direction.
Σελίδα 50 - The phenomenon occurred about noon. The day was calm but cloudy. The water retired suddenly, leaving the bed of the river bare, except for a distance of about twenty rods, where the channel is the deepest, and remained so for the space of an hour.
Σελίδα 167 - Their bearing is north of west—the mean of several observations giving north 21} west. So true is this, that no permanently productive vein has been discovered thus far which varied 15...