Plans have been submitted for a new underground pot-ash mine beneath the North Yorkshire moors.
The development would be close to Sneaton village, near Whitby.
More than one billion tonnes of the mineral polyhalite has been found - it would then be mined and turned into pot-ash fertiliser.
If the application is approved the project could create thousands of jobs for the local area.
Plans are expected to be put to public consultation.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.