United States or Uruguay ? Vote for the TOP Country of the Week !
The few specimens we obtained of its rocks consisted of the different varieties of talcose formation, with quartz and jasper. The specimens were of no great value, as they were much worn by lying on the beach. The higher land was bare of trees, and had it not been for the numerous fertile valleys lying between the sharp and rugged spurs, it would have had a sterile appearance.
The specific gravity of the objects does not affect their rate of sinking, as could be seen by porous cinders, burnt marl, chalk and quartz pebbles, having all sunk to the same depth within the same time.
On the other hand, Blake, in Geological Report, Pacific Railroad Rep., vol. v., p. 119, observes that the grains of the dune sand, consisting of quartz, chalcedony, carnelian, agate, rose quartz, and probably chrysolite, were much rounded; and on page 241, he says that many of the sand grains of the Colorado desert are perfect spheres.
But even without W. Keyse and the vanished author of "Fare Air's" letters the ferny tree-fringed kloof at the bottom of which the beer-coloured river ran over its granite boulders and quartz pebbles, was not empty and void.
Redburn pondered deeply on this subject, as he left the girls together, and went out to see to his duties in the mines. He found Terry and Fearless Frank in the quartz mine, looking at the swarthy-skinned miners; examining new projected slopes; suggesting easier methods for working out different lumps of gold-bearing rock.
"Before Heaven," I heard him whisper into her ear, "with all my power as a lawyer I will free you from this." Gently Dr. Leslie pushed him aside and felt her pulse as she dropped limply into the only easy chair in the laboratory. "O'Connor," he said at length, "all the evidence that we really have hangs on an invisible thread of quartz a mile away.
That adamantine mixture of gneiss and quartz, prepared in nature's laboratory throughout millions of years, was now furnishing the rock which, beneath human manipulation, was flowering into the great cathedral! And that perfect whole was ideaed first in the brain of man, and a sketch of it transferred by the sun itself to the blue paper which lay on the table!
"I don't know, for sure," said Charley, trying not to be foolish. "But I think this is quartz, all right enough; and if that yellow's soft enough to be scraped with a knife blade it's liable to be gold." He drew out his knife from his belt and scraped at the yellow. Where the yellow was thickest it could yes, it could be scraped in tiny shavings.
I measured one of the bucket-ropes, and found the depth of the well to be 28 fathoms. Dec. 19th. We departed from Buggil, and travelled along a dry, stony height, covered with mimosas till mid-day; when the land sloped towards the east, and we descended into a deep valley, in which I observed abundance of whin stone and white quartz.
There is also a considerable amount of gold obtained as a by-product from copper mining. Generally speaking, quartz mines are in the mountains and placer mines in the river valleys. Placer mining by powerful water pressure, called hydraulic mining, destroys the banks, and also fills up the river beds with masses of rock and gravel.
Word Of The Day