How much Gold at Fosterville?

The extract below is from:
http://s21.q4cdn.com/967674075/file...esourceupdateFeb202018FINALCLEAN.pdf[/BCOLOR]​

"Fosterville: Mineral Reserves increase to 1.7 million ounces at 23.1 g/t. Swan Zone Mineral Reserve doubles to over a million ounces at 61.2 g/t "

"Mineral Reserves at Fosterville increase 1,210,000 ounces or 247% from December 31, 2016 to 1,700,000 ounces @ 23.1 g/t (65% increase in Mineral Reserve ounces from June 30, 2017 mid-year estimate); Measured and Indicated (“M&I”) Mineral Resources increase 59% from December 31, 2016 to 4,190,000 ounces @ 8.4 g/t (inclusive of Mineral Reserves); Inferred Mineral Resources more than double to 1,900,000 ounces @ 7.1 g/t. "

The Mineral Reserve for Fosterville doubled between June and December of 2017
Fosterville now has​

Mineral Resources of 4,190,000 ounces.
They have probably mined about 2 million oz at Fosterville to date going back to 2006.
The gold at Fosterville is known to go down to 5.7km​

They are down to about 1km to 1.2km and have Mined about 2M oz.
The Reserve is 4.2 m that's = 6.2m oz in the first 1km to 1.2km of depth
(2m plus 4.2m) ​

They are only down about 20% of the way (to the 5.7km)
They have already found/mined 6.2m oz.
If it continues at this rate 100% would be 5 times as much Gold
So 5 x 6.2m oz is 31m oz at Fosterville
Grades have been increasing with depth at Fosterville.
But I have assumed in these estimates that grades remain the same.

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