The system for solar salt production at Lake Grassmere has been revised since this original design, drawn in 1947. The area of the lake bed is 1,500 hectares and originally the ponds were planned to cover just 526 hectares. The diagram shows a bombing range in the middle of the lake and an aerodrome to the right – the air force used the area as an airstrip during the Second World War. This design was superseded in 1962, when new crystallisation ponds were constructed. By the 1970s the entire lake bed was used for salt production. In the mid-1970s a proposal for a second solar salt works to be established at nearby Vernon Lagoons was looked at, but the idea was abandoned.
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Te Ara - The Encyclopedia of New Zealand
Reference: Salt: its production in New Zealand. Christchurch: Latex Rubber Company, 1947, p. 4
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