Horrible screaming vocalizations heard witnessed in Plumas County, California

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It was completely dark where we were. We had quite a large fire lit at the time. Nothing was found. Approximately at 9:00 pm at night after dinner we were all around the fire cracking jokes and laughing quite a bit. We go on the trips to the Granite Basin area at least twice a year. My friend Mark owns mineral rights to several mines in the area. The area is catacombed with several mines. Also noted, the area has many streams and creeks with beautiful clear water. Also noted, this is a very healthy forest with much new growth. Anyway, we were talking and laughing (my friend Mark is a loud person) and I have said that more than once how far I can hear him. All of the sudden he comes to me and says, "Andrew, shut up and listen." Mark seemed a bit riled up so I did what he asked. What I heard next, I will never EVER forget. It was this horrible screaming sound that I have heard before on my download from the Art Bell radio show. The one where you hear the sound he talks about saying...