A massive search is expected to get underway in Tenerife for missing teenager Jay Slater.

The 19-year-old disappeared following an attempt to walk back to his accommodation on June 17, after attending the NRG music festival on the island with two friends. 

Jay's last known location was the Rural de Teno Park in the north of the island – which was about an 11 hour walk from his accommodation.

On Friday, the Guardia Civil appealed for volunteer associations who were experts in rugged terrain to assist in a “busqueda masiva” - or massive search - this Saturday. 

Members of a search and rescue team search near the last known location of Jay SlaterMembers of a search and rescue team search near the last known location of Jay Slater (Image: James Manning/PA Wire)

The search will begin at 9am in the village of Masca, near to his last-known location, and will be coordinated to take in a steep rocky area, including ravines, trails and paths.

Anyone able to assist is asked to contact the Guardia Civil before 8pm on Friday.

The search for the apprentice bricklayer, from Oswaldtwistle in Lancashire, has now entered its 12th day, with his mother Debbie Duncan recently travelling to the island. 

Donations flooded in after GoFundMe appeal “Get Jay Slater home” was set up by Lucy Law, his friend and the last person to speak to him. 

More than £40,000 has now been raised as part of the fundraiser.

Earlier this week, Debbie said the money from the fundraiser - which has now topped over £40,000 - would be used to support mountain rescue teams, and cover her accommodation and food costs.

In an update on Thursday, Ms Duncan said: “We are currently working with GoFundMe to withdraw part of the funds, which are being safely held.

“I wanted to share that these funds will be used to support the mountain rescue teams who are tirelessly searching for Jay.

“Additionally, since our stay in Tenerife needs to be extended, we will also use the funds to cover accommodation and food expenses.”

Ms Law said Mr Slater told her in a frantic phone call before he went missing that he was “lost in the mountains, he wasn’t aware of his surroundings, he desperately needed a drink and his phone was on 1%”.

Search teams, co-ordinated by the Guardia Civil, have since mounted a huge manhunt using helicopters, drones and search dogs to scour mountainous areas of the island.

Ms Duncan has described her son’s disappearance and the wait for news as a “living nightmare”.