ANW featured as a COBALT stock in the ASX by Small Caps, page-465

This PARAGRAPH BELOW could hold the clue as to  why the massive volume and buying occurred Friday 5  minutes  before the close - perhaps the have a new discovery that is rather large LOL

Aus Tin Mining (ASX: ANW)

Aus Tin Mining is pursuing a cobalt zone at its 100%-owned Mt Cobalt project about 40km from Gympie in Queensland.
A 200m diamond drilling program was kicked-off in early December to test extensions to the historic cobalt and manganese mine where a 7m wide lode purportedly returned cobalt at an average 7.5% grade.
Nine reverse circulation holes were completed at the project in 2016 and produced a 7m interval grading 0.84% cobalt and another 7m interval grading 0.12% cobalt.
Aus Tin claims the its cobalt zone target is about 800m long and previously rock chip sampling at the project assayed up to 1.66% cobalt.