The development stages:Awaiting construction decision/2015-12.Block 21 is located in Pemex's Northern Region and is part of the Burgos asset. The block covers 28 square kilometers and holds 48Bf3 of original gas in place. Accumulated production from the area amounts to 22Bf3 of gas. The block's reservoirs are found in Eocene sandstones. The block was put out to tender as part of CNH's third phase of Round One. The block is part of 21 Type 1 blocks, which are expected to contain less than 100Mb remaining in their reservoirs.