Just to avoid confusion Talybont is on the website under its alternative name of Alltycrib where there is quite a bit of history. It is the subject of a book I have written, yet to be published.
There is a dearth of information about Talybont Lead Mines Ltd, although I have the company papers from National Archives.
I think I will convert them to pdf and upload them, they are of some interest.
If you look at the 1888 mine plan you will see the deep adit driven as a long crosscut from the Wern, at the end of the first straight section is what appears to be a bit of a manhole, this actually workings on south lode that connect with a surface shaft, the current means of entry. None of this is shown on the plan. The level then continues to North Lode where there is the Engine Winze sunk slightly to the north to pick up the lode at depth. The adit then follows North Lode in a westerly direction. There are working also to the east but again not shown on the plan.
I think that there was a lot of speculation about a 'missing' ore body on South Lode, the lodes are heavily thrown about by the powerful Alltycrib Fault, most of the ore obtained came from South Lode yet a whole length of it is barren at adit level.
To complicate matters any work from deep adit was not possible as there was nowhere to dump spoil at the Wern.
Pryces Tunnel was a bold venture and in my opinion it was mainly a gamble to try and locate the missing ore body, with its ultimate objective being to reach Air Shaft AKA Felix's where there were known reserves which it was expected would at least repay the cost of drivage. The Kelldrills were 'new technology' at the time and part of the 'sell'. I think the photo was probably used by TBLM and May as promotional material, who knows, but I am convinced the photo is Talybont.
Pryces Tunnel did in fact reach its objective but as I have said, they only got about 40 tons of ore out, it never connected with the pre existing workings following Clutterbucks revelations, and is therefore a blind heading.
Before forestation I am told that it was possible to trace remains of a tramway down from Pryces Tunnel to the mill.
The mode of operation is unfortunately all speculation.
My avatar is a poor likeness.