Sky reflected in Salt Pans at Lake Hart, South Australia
The following is an account of Lake Hart published in 1947 -
Although for long it has been deserted, Lake Hart, on the lonely mulga plains, has Australia's Prize Salt Deposit.
Standing beside the transcontinental railway, 137 miles [219 kilometres] from Port Augusta, is a 7,000 tons dump of the best quality salt in Australia. Behind it, stretching far northwards, is Lake Hart, the place from which the salt was taken.
In 1931 this was the scene of a thriving industry. Today, it is forgotten in its isolation amid the mulga plains of the north-west. Lake Hart's importance as a salt deposit first became manifest in 1918 when surveyors investigated its entire area. They estimated the yield as three million tons, and defined the lake's area as 61 square miles.
Following these observations, the Sydney firm which owned the deposit - the Commonwealth Salt Refining Company - began preliminary operations with a few men.
Small quantities of salt were harvested and bagged for testing purposes. At this stage no refining plant had been installed, and the salt was sent to Adelaide for refining. The finished product proved so successful that the CSRC immediately launched large-scale operations. They installed a refining plant, and employed more than 50 men. The employees camped at the site and depended for their stores on the Commonwealth Railway's weekly food train.
Salt was harvested by day and refined continuously by shift workers.
Harvesting methods then were slow and cumbersome compared with present day methods. Sweepers first swept the water forward to the elevated catchment pens, each of which was 300 ft long by 150 ft wide.
When the salt had been deposited on the floor, the water was allowed to flow back into the lake, leaving the salt banked in and around the pens. The salt was then swept up and loaded into carrying carts, which were towed to the nearby refining plant.
Driving power for the plant was supplied by a gas producer engine. At first a Crossley type of 35 hp was used, but as production accelerated, a large Hornsby engine of 50 hp was added. These two engines may still be seen among the skeleton plant which remains at the lake.
The first phase of the salt's refining began when it entered the crushers. For Lake Hart salt, this was a very thorough process, due to the crude product's unusual hardness.
From the crushers it was carried into the washing troughs. Here it was scoured free of all foreign matter and, after a series of swillings was passed into the dehydrator.
When this machine had evaporated all water from the now whitened grain, the salt entered its final process - the drying oven.
This machine dried out all moisture and at the same time killed any remaining germ life, before discharging the finished product.
Such refineries were, of course, greatly inferior to present day establishments, such as those on Yorke Peninsula. Here, the sea water itself passes through several evaporation condensers before the salt is extricated for a complicated refining. But with Lake Hart's pure quality salt extensive refining was not necessary.
Few facilities existed to enable workers to negotiate the obstacles of outback industrial settlement. One employee crossed the lake in a flat-bottomed boat to ascertain the salt content on the opposite shore. He sailed across, but had to row 15 miles on the return trip. Today, people of the north-west give him the honour of being Lake Hart's conqueror.
Extreme difficulty was experienced from the late summer downpours which are prevalent in this area. During these storms the lake often became flooded, rendering harvesting impossible. However, the company had prepared for such emergencies. Huge reserve dumps had been heaped in readiness, and refining was not hampered.
For several years Lake Hart yielded 9,000 tons annually. Most of the salt was shipped to Sydney, where it was distributed for edible and industrial uses.
Commercial users throughout Australia were elated with the quality. Housewives discovered that, in actual saltiness, the Lake Hart product was twice as strong as any other.
The biggest asset that the salt had was its freedom from gypsum. This was, and still is, a very rare credential. All other main Australian sources are handicapped by gypsum content, which not only reduces quality, but enforces excessive work and cost during the refining process.
In 1921 the company amalgamated with the Australian Salt Company. The firm experienced great difficulties in obtaining water for refining purposes, its only supplies coming from occasional supply trains. Further, the isolated position created problems in the delivery of the refined product. These difficulties were the chief reasons for the cessation of harvesting in 1931.
Yorke Peninsula refineries were supplying more than enough salt for the State's use, and, although the quality was greatly inferior to that of Lake Hart, it was considered unpayable to continue work on the lake. To Australia, its closing meant a decrease in the quality of salt in use: but the quantity remains plentiful.
Salt is in enormous surplus, not only in Australia, but throughout the world. Our own refinery at Price on Yorke Peninsula, for instance, can supply enough salt in six months to last South Australia for five years.
Ever since closing the Lake Hart plant, the Australian Salt Company has employed a caretaker on the premises. The present caretaker has held his lonely job for seven years. His duties are simple. He records the rise and fall of the lake, and is responsible for the maintenance of the depleted plant.
Much of the plant was removed soon after the work ceased, but the catchment pens, crushers and engines remain in readiness for a reopening of the industry.
Last year it was intended to restart the enterprise, but fate ruled otherwise. Heavy rain swelled the lake to such an extent that plans had to be temporarily abandoned.
There is little opportunity for anyone to see Lake Hart. Train tourists can, but as both the East and West bound expresses pass this locality during the night, few see what is Australia's prize salt deposit.
Ref: Advertiser (Adelaide) 6-9-1947 Article by W J Watkins
Sky reflected in Salt Pans at Lake Hart, South Australia
The following is an account of Lake Hart published in 1947 -
Although for long it has been deserted, Lake Hart, on the lonely mulga plains, has Australia's Prize Salt Deposit.
Standing beside the transcontinental railway, 137 miles [219 kilometres] from Port Augusta, is a 7,000 tons dump of the best quality salt in Australia. Behind it, stretching far northwards, is Lake Hart, the place from which the salt was taken.
In 1931 this was the scene of a thriving industry. Today, it is forgotten in its isolation amid the mulga plains of the north-west. Lake Hart's importance as a salt deposit first became manifest in 1918 when surveyors investigated its entire area. They estimated the yield as three million tons, and defined the lake's area as 61 square miles.
Following these observations, the Sydney firm which owned the deposit - the Commonwealth Salt Refining Company - began preliminary operations with a few men.
Small quantities of salt were harvested and bagged for testing purposes. At this stage no refining plant had been installed, and the salt was sent to Adelaide for refining. The finished product proved so successful that the CSRC immediately launched large-scale operations. They installed a refining plant, and employed more than 50 men. The employees camped at the site and depended for their stores on the Commonwealth Railway's weekly food train.
Salt was harvested by day and refined continuously by shift workers.
Harvesting methods then were slow and cumbersome compared with present day methods. Sweepers first swept the water forward to the elevated catchment pens, each of which was 300 ft long by 150 ft wide.
When the salt had been deposited on the floor, the water was allowed to flow back into the lake, leaving the salt banked in and around the pens. The salt was then swept up and loaded into carrying carts, which were towed to the nearby refining plant.
Driving power for the plant was supplied by a gas producer engine. At first a Crossley type of 35 hp was used, but as production accelerated, a large Hornsby engine of 50 hp was added. These two engines may still be seen among the skeleton plant which remains at the lake.
The first phase of the salt's refining began when it entered the crushers. For Lake Hart salt, this was a very thorough process, due to the crude product's unusual hardness.
From the crushers it was carried into the washing troughs. Here it was scoured free of all foreign matter and, after a series of swillings was passed into the dehydrator.
When this machine had evaporated all water from the now whitened grain, the salt entered its final process - the drying oven.
This machine dried out all moisture and at the same time killed any remaining germ life, before discharging the finished product.
Such refineries were, of course, greatly inferior to present day establishments, such as those on Yorke Peninsula. Here, the sea water itself passes through several evaporation condensers before the salt is extricated for a complicated refining. But with Lake Hart's pure quality salt extensive refining was not necessary.
Few facilities existed to enable workers to negotiate the obstacles of outback industrial settlement. One employee crossed the lake in a flat-bottomed boat to ascertain the salt content on the opposite shore. He sailed across, but had to row 15 miles on the return trip. Today, people of the north-west give him the honour of being Lake Hart's conqueror.
Extreme difficulty was experienced from the late summer downpours which are prevalent in this area. During these storms the lake often became flooded, rendering harvesting impossible. However, the company had prepared for such emergencies. Huge reserve dumps had been heaped in readiness, and refining was not hampered.
For several years Lake Hart yielded 9,000 tons annually. Most of the salt was shipped to Sydney, where it was distributed for edible and industrial uses.
Commercial users throughout Australia were elated with the quality. Housewives discovered that, in actual saltiness, the Lake Hart product was twice as strong as any other.
The biggest asset that the salt had was its freedom from gypsum. This was, and still is, a very rare credential. All other main Australian sources are handicapped by gypsum content, which not only reduces quality, but enforces excessive work and cost during the refining process.
In 1921 the company amalgamated with the Australian Salt Company. The firm experienced great difficulties in obtaining water for refining purposes, its only supplies coming from occasional supply trains. Further, the isolated position created problems in the delivery of the refined product. These difficulties were the chief reasons for the cessation of harvesting in 1931.
Yorke Peninsula refineries were supplying more than enough salt for the State's use, and, although the quality was greatly inferior to that of Lake Hart, it was considered unpayable to continue work on the lake. To Australia, its closing meant a decrease in the quality of salt in use: but the quantity remains plentiful.
Salt is in enormous surplus, not only in Australia, but throughout the world. Our own refinery at Price on Yorke Peninsula, for instance, can supply enough salt in six months to last South Australia for five years.
Ever since closing the Lake Hart plant, the Australian Salt Company has employed a caretaker on the premises. The present caretaker has held his lonely job for seven years. His duties are simple. He records the rise and fall of the lake, and is responsible for the maintenance of the depleted plant.
Much of the plant was removed soon after the work ceased, but the catchment pens, crushers and engines remain in readiness for a reopening of the industry.
Last year it was intended to restart the enterprise, but fate ruled otherwise. Heavy rain swelled the lake to such an extent that plans had to be temporarily abandoned.
There is little opportunity for anyone to see Lake Hart. Train tourists can, but as both the East and West bound expresses pass this locality during the night, few see what is Australia's prize salt deposit.
Ref: Advertiser (Adelaide) 6-9-1947 Article by W J Watkins