"Citi's mining team have gone positive on the big...

"Citi's mining team have gone positive on the big miners,upgrading BHP, Rio Tinto, South32, Fortescue Metals and Alumina to buy today.
The analysts pointed to significant price upgrades for commodities.
Key changes are iron ore to US$64/t, from $53/t, Met Coal to US$155/t from US$133/t, thermal to US$78/t from US$73/t, manganese to US$5.10/dmtu from US$4.13/dmtu, Copper to US$3.22/lb from US$2.91/lb, aluminium US95c/lb from 92c/lb and Alumina to US$360/t from US$340/t.
Expect 2018 to be a year of consensus upgrades and very strong free cash flow generation. If we continue to see disciplined capital allocation amongst a lack of projects and viable M&UA target, the free cash flow should come back to shareholders.
We prefer the diversifieds (BHP, RIO, S32) as we expect they will deliver cumulative free cash flow  US$56 billion over the next three years on our commodity price deck, with further upside to US$70 billion at spot commodity prices.
BHP shares are up 1.4 per cent. Rio Tinto is up 1.5 per cent and South32 is higher by 2 per cent."
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As expected we see a good strong sustainable rally in the high grade pricing as the artificial demand for high grade ores kick in for the Winter months. Can someone post the recent pricing of the 58% IOP discounts please? My first pass suspicion is that as BHP/RIO continue to have strong support, the funds are hedging their positions and playing the increase in the divergence with FMG.

The question I am asking myself without a good knowledge how the IO markets work is that if the high grade keeps getting stronger demand, will the 58% grading play catch up relatively speaking to the discounting % or will this discounting continue to wdens?