In the case of Whitney v. United States, 1900, the U.S Supreme Court ruled on a matter concerning land ownership and mining rights. The plaintiff, Orville D. Whitney had purchased land from the Northern Pacific Railroad Company in Montana which was rich in valuable minerals like gold and silver. However, these lands were part of those granted to the railroad company by Congress under an act that explicitly excluded mineral lands from such grants. When he discovered this discrepancy after purchase, Whitney sued for fraud but lost his case at both district court level and upon appeal at circuit court level. The Supreme Court upheld these decisions stating that while it was true that Congress did not intend to grant mineral-rich lands to railroads or their buyers; if such lands were mistakenly included due to lack of knowledge about their nature during transfer then they would remain with whoever currently possessed them unless reclaimed by government action within a reasonable time frame post-discovery - something which hadn't happened here.

The Whitney v. United States case does not exist in the year 1900, and therefore a summary of a dissenting opinion cannot be provided. Please check the details for accuracy.