> as lemmas

1849 Jrnl. Indian Archipel. & Eastern Asia 3 736 An ‘amorphous’ carbonate ore yielding 83 per cent of pure metal [sc. lead].

1855 Jrnl. Soc. Arts 23 Mar. 329/1 A deposit..of what the Cornishmen term white carbonate, yielding about thirty per cent of iron.

1879 Scribner's Monthly. Oct. 808/1 Prospectors went everywhere seeking for carbonates, radiating from this center [sc. Leadville, Colorado] up all the gulches, and over the foot-hills.

1892 Daily News 29 Oct. 6/4 The new bodies of carbonate ore.

1944 Jrnl. Iron & Steel Inst. 150 419 We are operating at present on a burden of 60% brown Northampton ore and 30% carbonate ore.

1971 Britannia 2 206 The industry..was based on the carbonate ore of the Wadhurst Clay, a reducible material with an average iron content of 40 per cent.

1984 Mining Ann. Rev. (Nexis) June 205 These ores contain economic quantities of chalcopyrite, galena and sphalerite finely disseminated in a gangue containing high proportions of pyrite with some quartz and carbonate.

2005 Alaska Business Monthly (Nexis) Nov. 54 The company reported that 27 of 51 exploration drill holes..intercepted variable thicknesses of white barite, white carbonate and massive sulfide.