This is (probably) one of the four A&T Burt-built, centrifugal pumps which were coupled onto a single shaft driven by the Leffel turbine. There is a piece of shafting about 3" diameter with [effectively] four 1/2" keyways cut into it. It is approx 3.3 metres long (I didn't have a tape measure) and as part of the "collection" of relics scattered around the site, it's most obvious function is the driving shaft of these four pumps which were reported as being coupled in tandem to give a high pressure pump". or. . . There are four Tangey pumps connected in a series on one shaft. I would doubt that they were connected "in series" but you never know!
Confirmation is difficult as there are very few surviving A&T Burt archived documents around
And from the Minister of Mines (James McGowan) in his statement to Parliament 1907 HYDRAULIC AND ALLUVIAL MINING. These systems of mining are confined to the goldfields of the South Island, the principal centres being in the Nelson, Westland, and Otago Provinces, where it is to be regretted a diminishing output of gold annually takes place. This is due to the exhaustion of the shallow deposits by the large fleet of dredges built a few years ago, and to extensive hydraulic sluicing operations; also to the absence of water in the more remote auriferous localities. The Tamaiti Gold-mining Company, which received a subsidy from the Government, has introduced a novel principle of working auriferous gravels. The water is raised from the Tuapeka River to a height of 30 ft. by means of a dam, and from that elevation operates a turbine and pump, giving a discharge of five heads on the terrace 150 ft. above river-level, the waste water being returned to the Tuapeka River. This comparatively inexpensive and efficient system of power for hydraulic sluicing might be advantageously applied in other parts of the colony. The future of alluvial mining depends upon the working of the lower grade and the more inaccessible deposits, which have been neglected or overlooked by the earlier miners, or else have defied them by reason of the conditions under which they occur.
So much for the enthusiasm, but what about the facts?
the company was incorporated in.
The dam was American "crib" design
local resident now 83 remenbers it as boy of 14 no logs standing but stumps in part of creekbed and concrete spillway and flume entry still visible.
now all gone.
pumps by ATBurtHowever by December 1908 the company was in dire straits and it was wound up in October 1909. A very great part of the problem faced by the company was a lack of rainfall over the two years since the dam was built and the claims granted. This lack of rainfall was endemic over Southland for the decade prior and a decade after, however it is a wet place there now (2012) and sluicing would be relatively easy. The drought had two effects on the commercial success of the Tamaiti Sluicing Company. It hardened the clay ground that comprised their claims and it denied them water for the sluicing. The idea of using a turbine and pump had been derived in the goldfields of the USA and Canada but the "mechanism" was not properly assessed by the directors. It is abundantly clear that they miscalculated the water consumption of the combined turbine and sluicing nozzles - seeing only the advantage of not having to "bring in" the sluicing water by elevated water race as was the common practice in all other sluicing claim areas. It is only with hindsight that it is possible to see how this was so attractive in countryside where streams carrying good flows at altitude above the claim were non-existent. The water in The Tuapeka looked so attractive if only it could be made available at a height above the claim - and of course the dam and the pipes and the pump did that - but only at a huge cost of consumption. The Leffel machine at Tuapeka Mouth looks like a 30" (inch) turbine. At 14' head, the company brochures guarantee it will give 95 HP at 203 RPM but at something like 4500 cubic feet of water per minute. That is nearly 3 cusecs - a flow rate that the Tuapeka river may have had during flood conditions only a few times a decade. At that rate and including the water being consumed and ejected by the nozzles, any small capacity dam on a small creek will be found wanting. The company records make it clear that it sometimes had sluicing water for just one eight hour shift per day.