There is more than one Himalayan pink salt, tapping deposits that formed at different places and times. The Khewra Salt Mine in the Punjab province is the largest salt mine in Pakistan and produces the majority of the Himalayan Pink Salt sold to export markets like the USA. The Warcha mine in Khyber Pakhtunkhwa province produces a salt that is often darker in color than some other Himalayan salts. Some feel (I’m not so sure I pick up on it, personally) that salt from the Kalabagh mine over the fertile Indus river valley has milder taste compared to other mines. Color varies from white to pink to red to silver-grey and even, occasionally, blue. Purity (absence of rocky debris) varies greatly even within the same mine as great swirling marled formations are exposed within salt seams extending deep into the earth.