Looking closely at the photo there are a few features which put a "no later than" date to it, but not much in the way of clues as to the actual date.
1. The Halvans engine house (the building with the chimney and long wooden gantry out onto the white tips), middle left, was reputedly built 'about' 1900 when the Halvans company was formed - but they might have used a pre-existing building.
2. The headframe over Old shaft (middle left of the picture) has 2 sheaves. It was reduced to a single sheave some time between 1911 and 1913.
3. The Compressor house - building with the 2 large chimneys on the right was built in 1881. There is no sign of scaffold, so it's likely to be after 1881 ... say 1882.
So realistically you can say the picture was taken some time between 1882 and 1911, based on point 1 the date range could be reduced to 1900-1911. If we know the photographer died in 1905, we are potentially left with a 5 year window.
The lack of smoke and steam from chimneys is also curious.
There is a picture taken from almost the same position on page 29 of "West Shropshire Mining Fields", dated 1910, but there are a few slight differences.