In reply to Removed User:
> wonder if this community would multi-task much with something like a 9mm rope off the rock face.
It depends on the rope. It's not the diameter which is the issue. Many climbing ropes are 9mm or even less, and although those are usually used in pairs they are expected to hold multiple falls. I would happily do what you're proposing on a 9mm climbing rope. The problem with your rope is that it is completely unrated, so you don't know what it is capable of bearing. It is not just a question of supporting your body weight (it probably can, and that's easy to test in a safe situation) but what forces it could withstand in the event of a slip or fall (which are considerably greater). It looks like a sturdy rope but it's a complete unknown. You also don't know how much it might stretch under load, or how resistant it is to abrasion - things which climbing ropes are designed for.
The problem with asking this community for advice is that most of us have access to more suitable ropes and wouldn't consider using a rope like yours. However if this were the only rope available to me I'd want to think very hard about the terrain and the consequences if it were to fail before trusting myself to it. There are situations where I might be willing to use it and others where I definitely would not.
From your description it sounds as if you will be using the rope itself to get down some steep or vertical ground above scree, and will be relying on the rope and not simply using it as a handrail on ground you could easily scramble down. If the location you describe is one you intend to visit frequently I'd certainly suggest you buy a properly rated rope. Any climbing shop should be able to advise you. But do you have the skills to anchor the rope and descend it safely, and climb up it again? A 9mm rope can be quite hard to grip with just your hands, especially if the sheath is slippery. Climbers use harnesses and specialised kit to descend and ascend ropes, and these need knowledge and preferably training to use.