Appears to be very good phosphate grades, but need more details on the historic drilling.
Massive exploration area and as they stated results obtained from widely spaced drilling, so its got good potential.
MAK is much further down the development path than STB, but with a mkt. cap. of $10m (fully diluted ~$14m) should be a good speculative stock if you want some exposure to fertiliser.
Cheers
SBC