Metminco has submitted a plan of works to the Colombian Mining Agency for the Miraflores project.
Completion of the environmental impact assessment, however, would be delayed by up to four months following adjustments to water monitoring plans.
'The lodging of the plan is a significant step towards mine development at Miraflores,' managing director William Howe said.
'Although further testing of water for the EIA will delay the submission of the document for approval, the company is still on track to have all of its approvals for mine development during 2018,' Howe said.
'The company continues to work closely with all stakeholders as it moves towards development of the Miraflores Project."