In reply to dapoy:
From that link
Site 1: Dinorwig Quarry
The idea here is to create a world class downhill mountain biking facility that could be a venue for a world cup downhill event within five years. The vertical difference from the summit of Elidir Fach to Llyn Padarn is 690 metres. There would be up to ten runs of various standards, with smaller specific dual slalom runs, dirt parks and associated facilities.
Site 2: Glyn Rhonwy
Here the plan is to create a more family oriented downhill and cross country course, with the associated facilities. From the summit of Cefn Du to Llyn Padarn, the vertical difference is 344 metres.
The land owners of the Dinorwig site, the First Hydro Company (an Edison International Company) gave permission for an initial scoping exercise to be done
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It's great that First Hydro are supportive of the plans, something of a contrast to Dali's Hole