I just looked back to the PR from 9/29/2015 when they previously announced a delisting notice from the NYSE MKT. The price at that time was sub .20, and and been for about a couple months. I'm pretty sure they only had ~252M shares at that time, so their cap had just fallen below $50M.
On 3/24/2016 they PR'd that they regained compliance. Prices during that timeframe had been around .26+, but they had just increased share count the prior month (see the PR from 2/26/16) to ~302M shares bringing their market cap to ~$78.5M.
I haven't dug into the GDXJ requirements recently...but I know for certain last summer it was a minimum of $150M, as .50 would have been a huge milestone for BAA as they could've potentially been added back into the GDXJ mix.