Don't have any info from site visits, sorry, only internet gleanings.
Latest Coal Authority list of licensed collieries, published in Digest of UK Energy Statistics 2016 edition (https://www.gov.uk/government/collections/digest-of-uk-energy-statistics-dukes page 61), with data current as at 31 December 2015, listed Aberpergwm as 'on care and maintenance'.
Latest information on Welsh Coal Mines Forum (http://www.welshcoalmines.co.uk/forum/read.php?2,49031,64151#msg-64151) is almost as old, having being posted 24 January 2016:
" All of the JOY Continuous mining equipment is down the 9ft ready to start at the push of a button, one of the last jobs the men did before it closed last year was to take all the equipment from the workings in the 18ft down to the 9. The coal is there sitting in front of the Miner ready to be mined, literally.
As regards to the New Drift, can't remember exactly, but there was something like 1600-2000 metres left to reach the 9ft. The New Drift is now the the intake, and the original drift where the coal comes out, is now the return, the new fans at the bottom of that drift carry out the ventilation. When they were mining last year, the coal was still coming out that way, new drift wasn't connected to ang belt lines, was just for man riding only."
The above is the only significant information I've seen since the colliery went from development to care and maintenance in the summer of 2015.
https://beta.companieshouse.gov.uk/company/04934085 There are two issued shares, both of £1.00; the number of directors decreased from two to one in September 2016. It seems to be a dormant company.
http://www.kccllc.net/documents/1502741/1502741150728000000000016.pdf Energybuild Mining Ltd is owned by Energybuild Holdings Ltd, the accounts of which are overdue (https://beta.companieshouse.gov.uk/company/04934473). Its paid up share capital is £112,000.
Energybuild Holdings Ltd is owned by Energybuild Group Ltd, the accounts of which are also overdue (https://beta.companieshouse.gov.uk/company/05451235). This is the significant company: its paid share capital is £56.1 million, entirely held by one of Water Energy Inc's Canadian subsidiaries (see Annual Return 14 May 2014). So the restructuring underway of Water Energy Inc's Canadian subsidiaries may impact upon Aberpergwm.
http://www.bizjournals.com/birmingham/news/2016/02/01/walter-energy-strikes-deal-to-sell-remaining-u-s.html )
http://www.kccllc.net/walterenergy Presumably when the Canadian subsidiaries are sorted out, a decision will be made as to what will happen to the UK subsidiaries including what will happen to Aberpergwm.
Basically it looks as if what will happen to Aberpergwm depends on long drawn out Canadian court actions being concluded.
DUKES 2016, p.43 stated that there were 50 people employed in deep coal mines in Wales as at 31 December 2015 (the most recent data online). Nant Hir No.2 was reported on Welsh Coal Mines Forum to be employing around two dozen; Dany y Graig no.4 was operating with a small number of employees - I'd guess half a dozen based on various threads on Welsh Coal Mines Forum; so the remainder of the 50 must have been at Aberpergwm. This seems to indicate that pumping and ventilation was being maintained at Aberpergwm at that time.
Unfortunately there seems to be no clues online since the end of 2015 as to exactly what has been happening at Aberpergwm. When DUKES 2017 is published in summer 2017, the Coal Authority will update the status of the surviving UK collieries, including Aberpergwm, as at 31 December 2016.
Hope these details are useful; apologies again that I do not have on-site knowledge of what is happening at the colliery.