 This portion of the ore body, which often extends to a depth of 80 feet or more, contains but little or no copper and is therefore of no commercial value, except as an iron ore. Below the gossan is found the black copper zone, which varies from a few...  The Gentleman's Magazine - Sida 621837Obegränsad förhandsgranskning - Om den här boken
 | Frederick Henry Arnold - 1864 - 136 sidor
...those of Wisboro' Green and Billingshurst, over an area of 20 square miles,! at a depth of 25 feet. "It occurs in layers that vary from a few inches to a...in thickness ; and are separated from each other by * November 20th continues to be the date of the largest of the fairs held at Petworth. t Petworth itself... | |
 | Augustus John Cuthbert Hare - 1894 - 280 sidor
...itself, but in the adjoining parishes of Kirdford, Northchapel, Wisborough Green, and Billingshurst. ' It occurs in layers that vary from a few inches to a...separated from each other by seams of clay, or of a friable limestone. This limestone is of various shades of bluish grey, mottled with green and ochraceous... | |
 | Augustus John Cuthbert Hare - 1894 - 276 sidor
...itself, but in the adjoining parishes of Kirdford, Northchapel, Wisborough Green, and Billingshurst. ' It occurs in layers that vary from a few inches to a...separated from each other by seams of clay, or of a friable limestone. This limestone is of various shades of bluish grey, mottled with green and ochraceous... | |
 | Geological Survey (U.S.) - 1895 - 714 sidor
...c, country rock. Scale: 1 inch = 15 feet. of several hundred feet along the drifts. The ore varies from a few inches to a foot or more in thickness and generally adheres to the contact of the dike and the country rock, as shown in fig. 19, though it frequently... | |
 | 1897 - 614 sidor
...rock is made up almost wholly of the remains of crinoids. Below the first ledge noted above, the beds vary from a few inches to a foot or more in thickness, the thinner beds prevailing near the base of the formation. Brachiopod shells constitute the major... | |
 | Geological Survey of Georgia - 1901 - 344 sidor
...or less extensively quarried for the drive-ways in the cemetery. The rock occurs in layers, varying from a few inches to a foot or more in thickness ; and it has all the appearance of a highly metamorphic sandstone. It is granular, and easily crushed into... | |
 | Illinois State Geological Survey - 1907 - 302 sidor
...often almost lithographic in appearance, with a distinctly conchoidal fracture. The beds are usually from a few inches to a foot or more in thickness and sometimes contain a considerable amount of chert. The lower beds of the formation indicate a gradual... | |
 | F. L. Ransome - 1918 - 760 sidor
...filled open spaces, as is shown by the growth of free crystals outward from the walls. Ore bodie,s from a few inches to a foot or more in thickness and 30 to 40 feet in length and depth have been worked in the upper portions of these veins, most of which... | |
 | Geological Survey (U.S.) - 1918 - 462 sidor
...has filled open spaces, as is shown by the growth of free crystals outward from the walls. Ore bodies from a few inches to a foot or more in thickness and 30 to 40 feet in length and depth have been worked in the upper portions of these veins, most of which... | |
 | Thomas Crook - 1921 - 512 sidor
...of the Griffin Range, in the same region. Here the nephrite occurs in the form of nodules and veins that vary from a few inches to a foot or more in thickness, and is associated with talc and calcite. It is from these rocks that the nephrite pebbles of the river... | |
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