 He moved there with his wife and children.On 1 April 1899, he was promoted to General Manager, a position he held until 1921.At BHP, he pioneered the froth flotation process for refining sulphide ore. Delprat foresaw the exhaustion of BHP's mine at Broken Hill, and pushed for moving the company's smelters to Port Pirie; also construction of the Iron Knob railways.