We saw, in distance, patch of white/yellowish surface covering the normally dark gray maintain slope. Looked like a beach from far.
When Acharya told us that it was snow, we though he was bullshitting.
Well, he was not.
In the winter, snow would cover the mountain slopes and the valley that we were trekking. When the summer came, most of the snow would melt away but not all. Some would still cover the river, and the river would flow under the packed snow.
The next day, we got our chance to walk on package snows, which has a running river underneath. The crossing was uneventful.
(26 Aug 2002, probably 70mm, ~1/4 second in S-mode, handheld leaning on rocks.)