esperanza silver provided an update (?) on san luis, but i have no idea what they did. I'm hoping this is just a preliminary news release and that more details will be forthcoming. as far as i know, silver standard hasn't released the details either:

Esperanza Silver is pleased to provide this update of activities at the San Luis joint-venture in north-central Peru. Esperanza has been provided, by Silver Standard the project's operator, with an update on the status of the on-going feasibility investigation together with supporting documentation.

Key findings include:

- Planning is based on the known Ayelen vein.

- Underground methods are used for mine planning.

- Gravity concentration will likely be used in conjunction with downstream processing of the gravity tailings. The final process flow sheet is yet to be determined.

Esperanza has reviewed the feasibility work done to date. It has provided Silver Standard with a letter report of its findings together with suggestions for continued investigation. Esperanza understands that some of this work is already underway.

Esperanza considers that significant new and additional work that is yet to be completed includes, but is not limited to, geotechnical drilling and evaluation, advanced metallurgical testing leading to final flow sheet selection, confirmatory tailings characterization and closure planning and feasibility-level design.

http://finance.yahoo.com/news/Esperanza-Provides-Update-on-iw-604548046.html?x=0&.v=1