STAFF from North Stradbroke Island miner Sibelco have been told the mine will shut in August.
Sibelco said there would be minimum job losses at the mine, which currently employs 70.
Most of those will be redeployed throughout the company.
The deadline was brought forward from December because Fisherman’s Track, a community thoroughfare, would no longer be mined.
Sibelco's Paul Smith said the mine's closure had nothing to do with recent falls in metal prices and was in line with a 2011 Act governing all mining activities on the island.
In May 2011, the previous Labor government passed the North Stradbroke Island Protection and Sustainability Act, which sets out deadlines for mining at Sibelco's three sand mining sites - Enterprise, Yarraman and Vance.
Under the Act, mineral sand mining at Yarraman must cease by the end of 2015, Enterprise Mine can keep operating until 2035 and the Vance silica mine will continue until 2025.
For mining at Enterprise to continue past 2019, the lease owner, currently Sibelco, will have to apply to renew the lease.
Also under the Act, 80 per cent of the island will be national park by 2026 and the Quandamooka people under an Indigenous Land Use Agreement will manage it.
Sibelco said it employed 14 per cent of Straddie's workforce and its operations contributed $130million to the island’s economy annually, and a further $100million indirectly.
The company said that contribution would not change "significantly" due to the already disproportionate contribution Enterprise mine made.
Sibelco CEO Campbell Jones said Yarraman's closure was a part of the company's commitment to reduce land holdings on Straddie by 80 per cent by 2020 and help the island form a post-mining economy by 2035, in line with the legislation.
"With redeployment of most of our impacted Yarraman employees on decommissioning, dismantling and rehabilitation of the Yarraman site and optimisation projects at Enterprise mine it is anticipated there will only be a small reduction in our workforce leading up to December 2016," a company statement said.
"The original custodians of North Stradbroke Island, the Quandamooka people will also continue to receive the benefits of sand mining through employment, community benefit and an ongoing entitlement to Sibelco’s royalties from the State Government."
Sibelco said it would continue to support the local community through employment, the Straddie Sand Mining Community Fund and Sibelco Community Development Program, and royalty payments to the state government.