Transactions . d its occurrence at thisplace, as Fig. 2 will explain. The vein, AC, had been faultedabout its own width, namely, 10 inches, by a small cross-seam,DE, and at this intersection, B, the pocket lay. The gold wasspongy and was intermixed with quartz. The clay which pene-trated the whole mass was partly red and ochreous, and partlya gray gelatinous material. In the quartz, and associated withthe gold, there were acicular black crystals of pitch-blende(uraninite), together with uranium ochre. This association ofgold with uranium is uncommon. New Zealand.—Intersections which coincide w
Transactions . d its occurrence at thisplace, as Fig. 2 will explain. The vein, AC, had been faultedabout its own width, namely, 10 inches, by a small cross-seam,DE, and at this intersection, B, the pocket lay. The gold wasspongy and was intermixed with quartz. The clay which pene-trated the whole mass was partly red and ochreous, and partlya gray gelatinous material. In the quartz, and associated withthe gold, there were acicular black crystals of pitch-blende(uraninite), together with uranium ochre. This association ofgold with uranium is uncommon. New Zealand.—Intersections which coincide with enrichmentsform a notable characteristic of the Hauraki gold-field* in thenorth island of Xew Zealand. In this district the occurrence * It is also known as the Thames district. 216 HIE FORMATION OF BONANZAS IN GOLD-VEINS. oi patches of Dative gold is an important feature of the regularmining operations. When I was there, in 1891, each stamp-mill had its specimen-stamp, a single stamp working in a Fig. lVM quartz \^rr\ SCHIST C\VlcLAY i Co., S. T. NATIVE GOLD CROSS SEAM OCCURRENCE OF A POCKET. separate mortar, and employed solely for the treatment of speci-men-ore. These rich patches occur at the places where the reefs or lodes cross bands of flinty quartz. The latter areknown among the miners as flinties. They vary in thick- THE FORM moN OF m»N VNZ IS IN GOLIM BINS. •J 17 Q688 from ;i few inches to mere threads of chalcedonic are barren in themselves, but have a favorable effect onthe gold-veins. The latter are also intersected by cross-veins,producing an enrichment similar to that caused by the Fig, 3 is a sketch of one of these intersections, as seenby me in the Moanataeri mine. The lode, A It. consists ofa Beries of small Beams of quartz, conforming to 111«- struc- Fia. 3.
Size: 1248px × 2003px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
