Argonaut Gold put out a recent press release which updated the status of its Magino and San Agustin projects. The release included the figures from a preliminary economic assessment for the San Agustin project.
For a capex of $67M, San Agustin would produce ~+50K oz Au/yr at a cash cost of $670 for 10.5 years. The project has a 22% IRR at $1200 Gold and $17 Silver. Note that a PEA is only preliminary and everything is subject to change in the future.