Sheep wash & boiling down vats at Groongal, river Murrumbidgee, N.S.Wales, National Library of Australia, https://nla.gov.au/nla.obj-138910390/view
Several people apparently had the same brilliant idea: kill the sheep and boil them for their fat, which was sold under the old name of “tallow”, which could be used in lighting, but also to grease the axles of carts and coaches, and even slow-moving steam engines.
Boiling down sheep in Australia, Illustrated London News, Oct.1868, National Library of
Sydney became for a time surrounded with boiling-down establishments at short distances from the city, and, in whatever direction one travelled, his sense of smell was revoltingly assailed by the tainted breeze wafted from these establishments along the road. — Roger Therry, Reminiscences, n., 228.
[Hamilton] bought up a quantity of four hundred gallon iron ship tanks, and rigged them out so simply that the modus operandi astonished the people. Hamilton had seen a good deal of whaling operations and thus understood the matter. The establishment was in close proximity to wood and water, and could therefore dispose of one thousand bullocks per week, and the rush for boiling down became so general that he purchased or rented a large soap factory at Johnston’s Bay, Annandale, where he also carried on a wonderful trade, the stock still increasing. Tallow and hides-being then a good price, it returned to the squatter for good cattle 40s. to 50s. per head, and some extra good have even realised 70s. each, but that seldom occurred.
— James T. (‘Toby’) Ryan, Reminiscences of Australia, 157 – 9.