Coking coal is up 13% this year but why do the returns vary across pure play coking coal producers?

Coking Coal hit a low of $180 in July 2025 and currently its close to $250. But, why are the returns vastly different across pure-play coking coal producers? * WHC : Whitehaven Coal is ▲ +13% YTD * SMR : Stanmore Resources is ▲+26% YTD * BRL : Bathurst Resources is ▼ -1% YTD * CRN : Coronado Global Resources is ▲ +37.5%