Misima,Tier1 ?

It seems on surface it might be, drilling shortly, below from the announcement of the investment.

"This investment provides Sandfire with exposure to a potential Tier-1 porphyry copper-gold exploration opportunity with outstanding upside. WCB has identified a substantial copper-gold porphyry target at Misima located adjacent to an historical gold mine formerly owned by Placer Dome Asia Pacific which produced 4.0Moz of gold and 20Moz of silver.
The main exploration target is the Misima Porphyry at Mt Sisa, where a very large 1km2 copper soil anomaly coincides with extensive rock chips, shallow drilling and a deep strong magnetic anomaly with skarn mineralisation and halo veining at surface. WCB plans to undertake diamond drilling later this year to test this target.
The Misima Project is located within a porphyry belt which contains four of the world’s richest primary grade copper and gold porphyries including Grasberg (4.9 billion tonnes @ 0.8% Cu and 0.7g/t Au), Ok Tedi (1 billion tonnes @ 0.7% Cu and 0.6g/t Au), Golpu (1 billion tonnes at 0.9% Cu and 0.6g/t Au) and Panguna (1.4 billion tonnes @ 0.5% Cu and 0.6g/t Au)*."

If one were to have a guesstimate  at tonnage of this 1km square anomaly for every metre of depth?