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An interesting trial of a new quartz crushing machine was held this afternoon at the Otago Foundry, Cumberland street, in the presence of a number of scientific gentlemen and others interested in engineering and in mining pursuits. Tho machine is called the Huntingionoentiifugal roller quartz crusher, and the particular one that was inspected io-dav was brought here by Mr Robert Neill, agent for the i atentees, Messrs Parks and Lacy. Though a novelty in New Zealand, we understand that the machine is largely used on AustmlCn goldfields, and is found to answer admirably the purpose for which rtis intended. The following is a description of its principle: —Attached to the ciurher is a No. 2 Dodge rock breaker and a Challenge ore feeder, together with two of Fine’s ore concentrators or vanning machines. The vanning machine is driven by an endless indiarubber belt 4ft wide, flanged on either side. This belt has a voiy slow travel endways, and a quick shaking motion sideways. I r - in fed by two pipes into an ore spreader, which distributes the whole width of the belt. At the head of the machine above tho bolt is a small tank with sixteen outlets which pour a thin continuous stream of water over the belt, and which at the Fame lime ws.sU the luin.eto.l3 that have been separated in the mushing machine. The shaking and revolving motions of the belt (which ia on an incline) can oasdy be altered to suit the diffment grades of ore winch pass over it. The ino iuo can be adjusted to from 3in to Gin. The first part of the process consists in feeding tho ore into the rock breaker, which again feeds it into an automatic Challenge ore-feeder. Then it is fed into tho mill, crushed and washed, and passed through veiy fine screens, which save the precious metal, and so well do they work that 98 per cent, of it U secured. The residue passes along a table some 14ft in length, which is covered with sheets of copper electro-plated, and has two quicksilver wells sunk in it. After passing over this table, tho broken ore is led into the conoentiator, where it undergoes further treatment. The mill requites a four horse-power engine to drive it, and the plant complete an engine of ten horse-power. The space required fir the complete machinery is about 40ft in length by 20ft in breadth.

A start was mads at three o’clock this afternoon, by which time a large number of spectators were iu attendance, and the work done by tho machine was watched with much interest. It was somewhat unfortunate that tho management were disappointed in not getting an expected supply of clean quartz for to-day’s trial, but that will be remembered to-morrow, arrangements having been made for the supply of a lot of stone from the Nenthorn reefs. The stuff put through today consisted of reeky mullock from Saddle Hill, and the manner iu which this was put through seemed to thoroughly satisfy the onlookers as to tho qualifications of the machine for its work. It is intended to keep the crusher at work for two or three weeks, and tho publio generally are invited to visit the foundry and inspect its working.

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Bibliographic details

A NEW QUARTZ CRUSHER., Evening Star, Issue 7961, 17 July 1889

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A NEW QUARTZ CRUSHER. Evening Star, Issue 7961, 17 July 1889