Coal Mining Occupation

[Linna]

I was reviewing a 1939 register entry for one of my ancestors and came across an occupation I cannot decipher. I have been on the Durham and Welsh sites recommended by others in this forum but can't find the occupation.
I have attached an image and hope that someone can enlighten me.

1939 Register reference is 7324J-009 XJGY line 39 for Albert Jay.

Thanks

[Rena]

Somebody will probably come along with exactly the right answer but I can only distinguish two words with certainty.

"Colliery" --- "Boy"

Young boys did a myriad of jobs; if the last letter was an "r", I could see the middle word as "Sorter" = Colliery Sorter Boy.   I haven't the foggiest notion of what needs sorting down a mine, but have found an old occupation list.

*pick sorter
    sorts blunt from sharp picks and other tools at pit bottom and distributes them to colliers; or places them in numbered holes ready for colliers.

http://doot.spub.co.uk/code.php?value=047

[tonepad]

Is it a poor spelling of:

Colliery errand boy

[JenB]

It's colliery screen boy.

This coal was passed over a 'screen' through which the small pieces and other detritus fell, leaving only the larger pieces of coal. This job was often done by young boys.

[stanmapstone]

A screen boy picked out dirt (stone or other impurity) from the coal as it passed on the picking belts. The coal did not pass over a "screen". See Horden Collieries Ltd. Screens - Blackhall at http://ppparchive.durham.gov.uk/photos/picviewer.asp?next=25 

Stan

[JenB]

The coal did not pass over a "screen".

Thank you for putting me right 

[stanmapstone]

You can see Screen Boys at an earlier time at http://www.healeyhero.co.uk/rescue/pits/Clifton/Screens.jpg

Stan

[radstockjeff]

Could it be "colliery bottom" boy?

[radstockjeff]

May be another name for a trapper - a young boy who would be employed at the air doors, opening and closing to allow the passage of tubs to and from the face.