Australian NP title A Pilbara gold rush guide, page-93

from the geological survey of WA

• Arthur H. Hickman
  • 31.52
  • Geological Survey of Western Australia

Abstract
The oldest part of the Pilbara Craton is 3.80–3.55 Ga crust. Between 3.53 and 3.22 Ga, mantle plume activity resulted in eight successive volcanic cycles forming the Pilbara Supergroup. Large volumes of granitic magma were intruded during the same period. By 3.22 Ga, a thick continental crust, the East Pilbara Terrane, had been established. Between 3.22 and 3.16 Ga, rifting of the East Pilbara Terrane separated off two additional terranes (Karratha and Kurrana), with intervening basins of oceanic crust. After 3.16 Ga, the three terranes began to converge, resulting in both obduction of oceanic crust (Regal Terrane) and, in another area, subduction to form a 3.13 Ga island arc (Sholl Terrane). At 3.07 Ga, the Karratha, Regal, and Sholl Terranes collided to form the West Pilbara Superterrane, and this collided with the East Pilbara Terrane. The 3.05–2.93 Ga De Grey Superbasin was deposited as a succession of basins: Gorge Creek, Whim Creek, Mallina, and Mosquito Creek. Eventual closure of the basins, between 2.94 and 2.93 Ga, formed two separate orogenic belts on either side of the East Pilbara Terrane. Post-orogenic granites were intruded between 2.89 and 2.83 Ga. The 2.78–2.63 Ga Fortescue Basin developed in four stages: (i) rifting of the Pilbara Craton; (ii) folding and erosion; (iii) large igneous province (LIP) volcanism; and (iv) marine sedimentation on a passive margin. A review of all known evidence for early life in the Pilbara Craton is provided. In hydrothermal settings, most of the evidence occurs as filamentous and spheroidal microfossils, organic carbon, microbial mats, and rare stromatolites. By contrast, shallow-water marine sedimentary rocks contain a diverse range of stromatolites, and microbial mats. Lacustrine and shallow-water marine carbonate rocks in the Fortescue Basin contain abundant and morphologically diverse stromatolites, widespread microbial mats, and organic carbon.

Review of the Pilbara Craton and Fortescue Basin, Western Australia: Crustal evolution providing environments for early life. Available from: https://www.researchgate.net/public...olution_providing_environments_for_early_life [accessed Nov 10 2017].

personal guess on it all
microbiological organisms /microbial mats/stromatolites concentrated the gold in the conglomerates imo it's already 90% proved just waiting on the last 10% why else have you got a prince from saudi and eric sprott jumping at the companies it's not just all theory it's almost just about proved and all the dots add up