FInding The White Mustangs of Death Valley

Rumors from advanced hikers are that they have seen a herd of rare white mustangs in Death Valley located just West of StovePipe Wells, up a 16 mile canyon and very far from civilization.
How long had they been there?
Where did they come from?
....Mining and ranching in this area has been vacated for almost 100 years
Why do they stay here?
..... harsh winters are followed by scorching summers
What colors are they really?
.... Cremello, Perlino, or Smokey Cream?
Come with me as I satisfy my curiosity !