Is it feasible and economical reasonable to get stuff from >1km depth?

Thanks alf01 for your Sudbury and SA (+3000 meter) reference:

I will give some examples of Canadian Nickel deposits/mines

a) Copper Cliff North: up to 2000 meter

b) Copper Cliff South / Kelly Lake: up to 1510 meter

c) Onaping-Craig : 1300 Meter up to 2600 meter (Deep Deposit)

d) Creighton: up to 3050 meter

As for grades and tonnage, because that keeps cropping up again and again:

Eagle 1 with average gades around 2% Nickel is certainly in the "world-class" league of deposits in Canada, as can be seen by the following examples:

a) Inco: Birchtree, Manitoba: 1,80% Nickel (13,6 Mt)

b) Falconbridge: Onaping-Craig, Sudbury: 1,55% Nickel (23,5 Mt)

c) Falconbridge: Raglan, Quebec: 2,85% Nickel (19 Mt)

d) Falconbridge: Montcalm, Timmins: 1,5% Nickel (7,2 Mt, not in production)

e) Inco, Kelly Lake: 1,77% Nickel (10,5 M)

f) Inco, Copper Cliff South, 830 Ore Body: 1,27% Nickel (2,7 Mt, not in production)

g) Inco, Copper Cliff North,138 Ore Body: 0,9% Nickel (300.000 t, not in production)

h) Creighton (Deep Deposit, >3000m): 81.000 t @ 4,6% Nickel

FANTOMAS