Hi Alpine Flyer - as you are probably aware, the operation to South Pole was a landing on snow rather than blue ice, and something definitely not possible with a Dash 7.
When the Dash 7 was selected for use by BAS, I believe there was some design work done into fitting it with skis, to enable it to be used for deep field work as well as the intercontinental link between the newly constructed gravel runway at Rothera, and Chile or the Falklands. However, I believe the design they came up with, while workable as an engineering solution, was never going to be practical due to range and payload factors (weight of the skis and reduced cruise speed, on what is already a slow design of aircraft due to its STOL capabilities).
However, blue ice with the Dash 7 is now a routine operation for BAS, and has been since around 1994. The site flown to is Sky Blu, a patch of blue ice at about 75S 71W, approx 500 miles South of Rothera, 4500' up on the Peninsula.
Blue Ice areas occur naturally in the Antarctic, usually in the lee of exposed mountain tops, where the prevailing winds scour the snow off the underlying glacier ice. The surface can vary a lot, depending on conditions and temperature - sometimes absolutely slick and smooth, sometimes a small amount of grip, and sometimes quite textured with "sun-cups" (small, 2-3" dia. shallow depressions, than can be a bit bumpy).
With no braking at all, the stopping is completely by reverse thrust, but at normal landing weights in the Dash, you are touching down pretty slow (80-90 kts). The crosswind limits are about 10kts max, and taxiing needs a slightly modified techniqe, as with no grip, the nose-wheel will not steer you and you rely on differential power, but you do need to keep the nose-wheel aligned with the direction of turn otherwise you get some nasty juddering.
One time, we managed to demonstrate just how little friction there was by taking off with the Parking Brake (inadvertently, due to a non-standard sequence of events) left on. Only realised half way back to Rothera!
The big advantage of using the Dash to Sky Blu is that it can move as much payload in one round trip from Rothera (4h40) as it would take in about 30 hours of Twin Otter flying, and has greatly reduced the amount of fuel positioning that used to be done by Twin Otter for the deep field work.
This link
https://www.bas.ac.uk/polar-operatio...sh-7-aircraft/ should take you to the BAS webpage with more info on the Dash, and a nice photo of it landing on the ice,
And this link
https://www.bas.ac.uk/wp-content/upl...blu_010113.pdf should take you to the approach chart for Sky Blu, with further information and a nice aerial shot of the blue ice.
I flew the BAS Dash 7 between 1997 and 2009, and probably did around 100 landings at Sky Blue - miss it a lot.