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The company offered no explanation for the sudden departures.
The board appointed chairman Ross Smyth-Kirk as interim executive chairman; chief operating officer Tim Benfield as interim CEO; and general manager finance and administration Ross Coyle as acting CFO, pending permanent appointments.
Day, a former Newcrest Mining executive and Kagara CEO, was appointed in July to replace the late Gavin Thomas.
He only started his role on September 8 and was being paid $A675,000 per annum plus incentives.
Former Whitehaven Coal finance executive Perrin only started with Kingsgate on September 22.
Kingsgate general manager, corporate and markets Joel Forwood has been the recent face of the company, presenting at Diggers & Dealers and the Denver Gold Forum.
Shares in Kingsgate dropped 1.4% to 68.5c.
