A nice respectable cape that shouldn't take longer than a month/2.
So far I own two of these capes (two accounts) and 4 other accounts with 90+ mining.
Botting Personally I botted one of the 99's while I did the other one 100% legit, mining isn't too bad just takes a bit of patience.
Here is how its done
Picks| Level needed
Iron 1
Steel 5
Mithril 20
Adamant 30
Rune/inferno adze/Stealing Creation Pick (2x xp) 40
Dragon 60
1-15
Ore: Copper/Tin
Spot: Varrock East Mine, West Mine
Bot: http://villavu.com/forum/showthread.php?t=57911
Profit: 0
15-80
Ore: IRON!
Spot: Rimmington Mine, Falador West Mine, Tree Gnome Mine (Very low key mines)
Bot: http://villavu.com/forum/showthread.php?t=57911
Profit: 0
80-99
Ore: Concentrated Gold Ore
Spot: Living Rock Caverns (Falador mine)
Bot: (None available)
Profit: 34m
Note: This area is not SAFE (Using a world like 77 is recommended) There is a bank in the closed off area so banking is simple. 40k xp/h (But with minimal attention needed provided you have a higher defence level).
Locations:
West and East mines in Varrock (Map shows while standing in center of Varrock)
"West" Falador Mine (Its past the broken wall)
http://runescape.wikia.com/wiki/Rimmington_mine
http://runescape.wikia.com/wiki/Living_Rock_Caverns