no, they can't be used as you describe.
In fact they can. They talk about this exact scenario at the very bottom of TFA...
These craft have severely limited capacity for cargo
Their absolute cargo capacity doesn't matter... It's a question of cost per kg of cargo. Since airships need to consume extremely little fuel, they are extremely economical to operate, and the cost of shipping heavy materials will be vastly less expensive than flying them on conventional airplanes.
What's more, you'd be far, far better off just getting a Chinook, as those are much smaller and are designed to handle a substantial amount of cargo.
That's absolute nonsense. A helicopter will consume MORE fuel than conventional airplanes, has less range, and moves more slowly, all for the convenience of VTOL. An airship will be VASTLY more economical to operate.
Anybody with a mine doing substantial volume is going to have to have roads anyways, as miners do need to eat, and there's a tone of other supplies involved as well.
The diamond and oil mines in the arctic are operating without roads... Instead they truck in supplies at great expense only part of the year, over the ice. The Alaska pipeline was perhaps the most expensive engineering project in history, and the investment nearly bankrupted the whole US oil industry. Until recently, the South Pole McMurdo station was operating without a road over the 1,000 mile distance, and it was an incredible expense to develop, only profitable because conventional aircraft are so expensive to operate that it cost double the jet fuel for a given cargo weight to fly in supplies.
In short, there are MANY places that don't or perhaps CAN'T have roads, yet are profitable locations that need lots of bulk freight deliveries. Pretty much everything you've said in your comment is undeniably factually incorrect, and if these airships prove reliable, they may have a few incredibly profitable routes.