| 释义 |
black sand
[black a. 1.]
Dark-coloured sand, esp. that on beaches in Australia and New Zealand; also attrib. Hence black-sander, a beach-comber who washes the black sand of the beach for gold; black-sanding vbl. n., this process or occupation.
1778D. Samwell Jrnl. 27 June in Cook Jrnls. (1967) III. ii. 1120 We came to an Anchor in about 30 fathms Water with bottom of black sand and shells. 1849Rep. Comm. Patents (U.S.) (1850) 405 Much of the black sand now in use is colored, and is common silicious sand, but the best article is a ferruginous sand. 1874A. Bathgate Colonial Experiences xi. 147 It promised well from the quantity of black sand visible in the dish. 1882Jrnl. Iron & Steel Inst. I. 251 It was found very difficult to work this black sand, on account of the large percentage of titanic acid it contains. 1906in P. Galvin N.Z. Mining Handbk. 122 (heading) Black-sand beaches on the West Coast. Ibid., At present there are small parties who earn a good average living by what is known as ‘blacksanding’..between Jackson's Bay and Karamea. Ibid. 124 The ‘black-sanders’ reaped their harvest. Ibid., What old leads there were were then washed out in detail and most of the gold secured by the busy ‘blacksanders’ in the process. 1965G. J. Williams Econ. Geol. N.Z. ix. 130/2 A ‘blacksand’ is material containing opaque iron-bearing grains in sufficient quantity to impart at least a grey colour to the whole. |