IMO, the Cueva Blanca did contain an economic deposit. I believe the CEO,s words in the news release below helps justify this.

"proved that the quartz veins consistently contain gold and silver and that the Cruz Vein system is a classic epithermal gold-silver deposit."

"Vein material of the Cruz Vein system yielded gold in rock assays from 0.08 to 15.46 grams. Seventy-two samples were above 1 gram gold and twelve samples were above 5 grams. The Cruz quartz vein/stockwork system contains individual quartz-calcite veins up to 6.5m wide, although most of the exposures in the system consist of narrower veins forming sheeted zones over widths up to several tens of metres (Summary Report, Sivertz, 1999.)"

http://steliasmines.com/?p=562

Also, an unofficial resource estimate done years ago suggests over 100,000 ounces of gold and almost a million ounces of silver.