In the shaft, at the depth of 40 feet, is a 2-foot quartz vein with tin ore at the junction of the elvan with porphyry. A wedge-shaped diorite mass, partly decomposed and partly very hard and quartzose, comes in at the north end of the shaft, as shown...
Bowen River Coalfields: Preliminary Report Relating To) - Page 16
by Robert Logan Jack - 1883 - 2 pages
Full view -