W.V2 Canadian Record of Science. 



The work is carried on in two quarries or faces. No. 1 

 cuts into the hill from a level of about 25 feet below the 

 summit, and is designed simply to remove the top of the 

 mountain for the purpose of passing it through the 

 stampers. No. 2, or Magazine Quarry, presents the aspect 

 of a " sidling " road cut out of a steep hill, and attacks 

 the auriferous deposit at a level of about 100 feet below 

 No. 1. " The central portion of the upper cutting is a 

 large mass of brown haematite ironstone, generally in 

 great blocks (up to some tons in weight), with a stalactitic 

 structure, as if the iron oxide had gradually filled up 

 cavities left in the original deposit. The ironstone con- 

 tains gold of extraordinary fineness, which, however, after 

 a little practice, can be detected in almost every fresh 

 fracture. The ironstone is more or less mixed with 

 fine siliceous granules. Gradually to the right and left of 

 the central mass the silica more and more replaces the 

 ironstone. It is a frothy, spongy, or cellular sinter, some- 

 times so light, from the entanglement of air in its pores, 

 that it floats in water like pumice. Fine gold is dissemi- 

 nated throughout this siliceous deposit as well as in the 

 ironstone. Near the west of the cutting is a vertical 

 dyke of kaolin mixed with fine siliceous granules, passing 

 into pure kaolin with some silicates of magnesia, including 

 a fine variety of French chalk. 



I selected a number of specimens as characteristic of 

 the various deposits of the upper cutting. These, when 

 assayed by Mr. Karl Staiger, City Analyist, Brisbane, 

 gave the following results : — 



No. 5. — Stalactitic brown haematite from middle of 

 cutting, 6 oz., 11 dwt., gold per ton. 



No. 6. — Siliceous sinter, veined with quartz, 4 oz., 

 5 dwt., gold per ton. 



No. 7. — A mixed mass of ironstone and silica from 

 level of the road, east of the dyke, 5 oz., 3 dwt., gold 

 per ton. 



