• Floating cone parameters include: Pit slope of 42 degrees, Mining Cost of $2/tonne ore and $1.75/tonne waste, processing and pad costs of $2.50/tonne ore, G&A costs of $0.50/tonne ore, and gold recovery of 65%. These parameters are believed to be reasonable, order-of-magnitude estimates for a low-cost, run-of-mine, heap leaching operation.

2) you say;

0.3 to 0. 4 is a more proper cutoff limit when taking into account economics and if you are speaking of Tesoro then you also have to take into account the difficulty in setting up a mine(no water nearby, limited access etc) as well as the depth of the anomalies(very deep making mining difficult).

2) I say Tesoro can return economical gold at .2 g/t through heap leaching, do the math! What difficulty in setting up a mine? This will be open pit and will change over to shaft mining should the deposit keep extending to the depths as per our current info. So, it is clear you are bashing, There is water nearby, and I did post factual info a month or so ago, showing the new techniques used to contain and conserve water and how it could be trucked in or pumped up over the hill via pipeline. The access is not limited, there is year round access as hog has posted in an earlier post. Mining will not be difficult at all, you start to hit the top of the Giant anomaly at 100m below surface, the other 300m, well within open pit depths of 1200m.

Read this!

Records

As of 2008, the deepest mine in the world is TauTona in Carletonville, South Africa at 3.9 kilometers,[47] replacing Savuka Mine in the North West Province of South Africa at 3,774 meters.[48] East Rand Mine in Boksburg, South Africa briefly held the record at 3,585 meters, and the first mine declared the deepest in the world was also TauTona when it was at 3,581 meters. The deepest mine in Europe is Bergwerk Saar in Saarland, Germany at 1,750 meters. The second deepest mine in Europe is Pyhäsalmi Mine in Pyhäjärvi, Finland at 1,444 meters. The third deepest mine in Europe is Boulby Mine England at 1,400 meters (shaft depth 1,100 meters).

The deepest open pit mine in the world is Bingham Canyon Mine in Bingham Canyon, Utah, United States at over 1,200 meters. The largest and second deepest open pit copper mine in the world is Chuquicamata in Chuquicamata, Chile at 900 meters, 940,600 tons of copper and 17,700 tons of molybdenum produced annually.[citation needed]

The deepest open pit mine with respect to sea level is Tagebau Hambach in Germany, where the ground of the pit is 293 meters below sea level.

The largest underground mine: El Teniente, in Rancagua, Chile, 2,400 kilometers of underground drifts, 418,000 tons of copper yearly. The deepest borehole in the world is Kola Superdeep Borehole at 12,262 meters. This, however, is not a matter of mining but rather related to scientific drilling.