| Lake Bumbunga | |
|---|---|
 Satellite view of 15 square km Lake Bumbunga in summer, when the water level is at its lowest (click to enlarge) | |
  Lake Bumbunga Location inSouth Australia | |
| Location | Mid North region,South Australia |
| Coordinates | 33°54′S138°11′E / 33.900°S 138.183°E /-33.900; 138.183 |
| Type | Salt lake |
| Basin countries | Australia |
| Surface area | 13.88 km2 (5.36 sq mi)[1] |
Lake Bumbunga is asalt lake located in theMid North of the state ofSouth Australia, between the town ofLochiel and the farming locality ofBumbunga, approximately 1.5 hours' drive fromAdelaide. It is apink lake, with its colour due to certainalgae.
Salt has been mined there almost continuously since 1881, and it has become a tourist attraction, along with its "Loch Eel Monster" sculpture in the middle of it.
The lake lies in thetraditional lands of theKaurna people.[2][3]
According to anthropologistNorman Tindale, the name Bumbunga derives from the wordparnpangka in the localAboriginal language (Kaurna), meaning "rain water lake".[4]
The lake is situated in the Mid North of South Australia, approximately 125 km (78 mi)[5] (1.5 hours' drive) from the state capital city,Adelaide.[6] Easily visible fromHighway 1 for a distance of 10 km (6.2 mi), the 15-square-kilometre (5.8 sq mi)[7] Lake Bumbunga is a dramatic departure from the surrounding landscape due to its seasonal pink colouration and wide expanse.[8] The colour is due to a certain type of algae which tolerates its high salinity and produces pink pigment that helps it to take energy. The colour changes throughout the year; it is often pinker inspring than winter, owing to more fresh water bringing nutrients to the algae and increased sunlight compared to the winter months. Summers are dry and the water evaporates.[5]
The lake is the largest of a system ofQuaternaryHolocene saline lakes extending about 30 km (19 mi) north ofLochiel, draining an area to the east of theBarunga Range, where it merges with theHummock Range. Salt is dissolved from saline mud produced when winter rain fills the lake.[9] Each summer a large portion of the lake dries up.[8]
Salt is precipitated fromgypsum, are precipitated out at this stage.[further explanation needed] The water is then pumped into crystallising ponds, where common salt precipitates. The process is stopped before all the salt comes down in order to avoid contamination with magnesium andpotassium salts. The final liquors, known asbitterns, are drained away from the salt, which is then harvested. At Lake Bumbunga,brine is pumped into three 25 hectare (62 acre) crystalliser ponds for refining.[9]
The potential of Lake Bumbunga's shallow waters forsalt harvesting was recognised in 1868. Salt was harvested from the lake bed in summer months from 1881; two years later, output was 6.1 to 8.1 tonnes (6 to 8 long tons) per day. Evaporation pans, furnaces, tank and men's quarters were built at the northern end of the lake. Mining provided employment and other economic benefits for many years; the town of Lochiel, on the west bank of the lake, is said to have "developed slowly with the industry, its survival in the 20th century being almost totally dependent on the salt harvesting".[8][10] By 1910 there were at least three lease-holders scraping thousands of tons of salt from evaporation pans when the lake dried up – usually in December.[8] In 1913, the Australian Salt Company was incorporated and held all the lake leases until 1971, when the company became a wholly owned subsidiary of Cheetham Salt Company Limited – now Cheetham Salt Limited, Australia's largest producer and refiner of solar salt.[11][note 1]
Efficiency of transportation was improved in 1926 after a 9 km (5.5 mi)[12] branch line was built from the nearbySalisbury railway line,[13] enabling transport directly to Port Adelaide.[10][note 2] DuringWorld War II, when salt was need for munitions manufacture, employment rose from 30 to 100 workers, with three shifts a day, and two trains a week transported the product in bags.[14] In 1967, 1000 tonnes a day were harvested; at that time South Australia was producing 80 per cent of Australia's salt, although that soon decreased, with major expansion of solar salt production in Western Australia. Forty years later, average annual production was reported as 10,000 tonnes (11,000 tons).[9] From 1996 to 2012, the works closed and no salt was harvested.[14] With harvesting becoming practicable using onlyfront-end loaders andtrucks, the maintenance and salt works buildings became redundant and were demolished in 2000.[7][8]
The lake is a tourist attraction owing to its pinkness, with its popularity growing in recent years, attracting stops bytourist buses.[6]
Afibreglass sculpture named the "Loch-Eel monster" (wordplay on Lochiel, the nearest town, whose namesake is a forest in northernScotland[6]) is visible in the middle of the lake. The backstory for the monster harks back to a time whenbullock (ox) teams were common, in the late 1880s. The story goes that bullocks were walking over the lake when they were "spooked by some sort of monster, went to the wrong part of the lake... and gradually got sucked under and went down".[5] The original version of the monster was created from piles of old tyres, and locals called it theLoch Ness monster's cousin. After the head got stolen in 2017, work began on the fibreglass replacement.[6]
There is awalking trail around the lake for tourists.[5]
The lake has been used as background for advertising byR. M. Williams,Mercedes-Benz,Foxtel and others, as well as fashion shoots for theAdelaide Fashion Festival.Tim Minchin used Lake Bumbunga as afilming location for his TV seriesUpright,[6] with a cast of more than 50 people on the lake.[5]
