they outlined a plan when they raised the last 28million, said...

they outlined a plan when they raised the last 28million, said the funds would be more than enough to execute the plan to end of year. That end of year is 5 months away, this leaves lots of room for tweaking the plan before cash runs out at current burn rate.

by what means do ‘junior explorers’ avoid dilution? Is this a possibility or is it a necessary yet inevitable ‘evil’?

I would have thought it quite difficult to find and define a resource without drilling holes? Drilling holes costs money as do the people advising the areas which are most likely to return the best results.