Dubbed Destination Hillend, the proposals will see the UK’s highest zip line and longest alpine coaster built into the Midlothian hillside.

If approved, the project could also include a new reception building, food court, shops, activity dome and glamping wigwams as well as a hotel and freestyle jump slope extension.

Councillors agreed to invest £13.8 million of capital funding into the project earlier this year.

Subject to the necessary consents the attraction could be up and running by 2022.

In the application for planning permission in principle, consultants Sweco said the expansion of the centre will use discreet buildings, giving rise to a low degree of landscape change.

The firm said: “As the Midlothian Snowsports Centre is an existing outdoor sports venue and recreation centre, it is considered to be an appropriate location for further outdoor sporting, recreation and leisure facilities.

“The proposals will improve the existing outdoor facilities on offer at the centre, which are in need of upgrading, and will also provide further facilities to the centre, increasing opportunities for outdoor recreation at the site.”