FIG 1. To produce 1 kg of fur requires 11.4 mink pelts, i.e. more than 11 animals. In the course of its lifetime, one mink eats almost 50 kg of feed (including the share of the mother animal), resulting in 563 kg of feed per kg of fur.

For decades, fur production has been a hotly debated issue in many Western countries.
Anti-fur associations point to animal welfare issues, including poor-quality living conditions and have ethical objections to mink being kept for their fur.
The fur industry, for its part, considers fur production a ‘green’ agricultural activity, and cites the measures being taken to reduce CO2 emissions and water and energy consumption.
Fur is thus being positioned as an environmentally benign, ‘natural’ product.
Whereas the following subsequent production steps are performed:

Mink feed production:
The feed consists of chicken and fish offal, supplemented with wheat flour and additives.

Mink keeping:
Mink are bred for 7 to 8 months, after which they are pelted.

The pelt is removed from the carcass, cleaned and dried.

The majority of mink pelts are sold thru auctions for the scale of those auctions please see the following link:

Fur treatment:
Processes to transform the stiff pelt to fur ready for further handling in the fashion industry.

Between all the various phases there is transportation.

The environmental impacts calculated in this, cited, study can thus be seen as minimum impacts; in all likelihood, the actual impacts will be greater.

The environmental impact of mink fur production
feed, results can be considered relevant for other European mink fur production.

The feed consists mainly of offal, which is of low economic value and is therefore only assigned a small share of the environmental load of chicken or fish; as the meat fit for human consumption has the highest value, it is allocated the bulk of the environmental impact.

Cultivation of the wheat also has an impact. Although the total environmental impact of 1 kg of mink feed is not particularly high, the 563 kilos required to produce 1 kg of fur knocks on considerably in the total environmental footprint of fur and for 14 of the 18 impacts studied feed is the predominant factor.
(please see FIG 1.)

Compared with textiles, fur has a higher impact on 17 of the 18 environmental themes, including climate change, eutrophication and toxic emissions.
In many cases fur scores markedly worse than textiles, with impacts a factor 2 to 28 higher, even when lower-bound values are taken for various links in the production chain. The exception is water depletion: on this impact cotton
scores highest.

Other factors making a sizeable contribution to the overall  environmental impact of mink fur are emissions of N2O (nitrous oxide) and NH3 (ammonia) from the mink manure. 

These emissions contribute mainly to acidification and particulate matter formation.
The climate change impact of 1 kg of mink fur is five times higher than that of the highest-scoring textile (wool).  
This is due both to the feed and to the N2O emissions from the mink manure.

(M. Bijleveld et. al 2011)