Ben Cheek, formerly of Gordon but now residing in Manchester, was due to finish his solo trek of the 20,000ft Shamshal Whitehorn on July 15 but has not been seen since he started the climb four days previously.
Searches in Pakistan have now been stepped up, with Pakistani military helicopters involved after bad weather last week meant it was unsafe for the aircrafts to be used.
But the Foreign Office confirmed as we went to press (Wednesday) that there had so far been no sign of the 28-year-old, whose family still live in Gordon.
Mr Cheek had previously attempted to take on the Shamshal Whitehorn in 2006 with fellow expeditioners Lee Harrison and Peter Thompson, who is involved in the rescue mission.
And the dangers of climbing the Pakistani mountain would have been known to Mr Cheek after his attempt two years ago was aborted when he was hit by falling rocks.
Mr Harrison said in his blog of the accident on summitpost.org: "Ben's trousers were already soaked in blood, the rock having punctured a hole through three layers of clothing leaving a clean hole in his thigh below.
"The first thing was to control the blood flow then get him off the mountain. The summit attempt was over and there were new priorities at hand."
Thankfully, Mr Cheek recovered from his injuries and the group made it safely back to base camp.
But Mr Harrison added on his trip report: "Whether I will ever try and climb Whitehorn again is another matter.
"There is no easy and totally safe way to climb this mountain...the local kids were right when they shouted at us 'Whitehorn, bad mountain, bad mountain' prior to the climb."
Mr Cheek's concerned family still wait for updates and sister Laura told the Berwickshire News: "There is no further news or sightings and we are still waiting. A helicopter search took place today (Monday) but there was no sighting.
"We are doing everything we can to push for his safe return. We are praying we get him back and if everyone else could do they same, that would be great."
Miss Cheek also told a number of national newspapers that her brother had been told not to climb the Shimshal Whitehorn, situated in the Gojal county of Pakistan.
She added: "They did advise him that it was a very dangerous undertaking to go on his own and they are extremely worried about him.
"He has been in dire situations before and he has survived for long periods in extreme conditions.
"We're just praying that, at the moment, he is well and just waiting for rescue."
The Cheek family's hopes of a safe return of their son and brother were raised last Thursday when two Italian mountaineers were rescued from another Pakistani mountain, Nanga Parbat. The mountain is also in northern Pakistan and, similar to Shamshal Whitehorn, is thought of as a dangerous peak to negotiate.
Ben had originally travelled to Pakistan as part of a team that failed to scale Distaghil Sar, also in northern Pakistan.
A press statement from the Cheek family said: "Following the 2008 Distaghil Sar North Ridge Expedition's unsuccessful attempt on this 25,863 ft peak, which had only been scaled twice before, the team split up with Ben setting off on a five day solo climb on Shimshal Whitehorn.
"Conditions in the area are deteriorating and he is now long overdue.
"Ben's experienced climbing colleagues from the 2008 Expedition, Bruce Normand (leader) and Peter Thompson are co-ordinating a search and rescue mission from Shimshal village.
"They have requested the help of the highly skilled Pakistani military helicopter pilots, which now offers by far the best hope of successfully locating Ben."
Ben Cheek is originally from Brighton, but moved with his family to live in the Ettrick Valley, near Selkirk, as a child. He attended Selkirk High School before his family moved to Gordon.
The experienced climber then left the village a year ago to live and work in Manchester as a research biologist.
A Foreign Office spokesperson said: "Unfortunately there are no further developments. We are in contact with the family and Pakistani authorities and are providing consular assistance to the family."