How and who buried the plates?
The golden plates were kept by Mormon at first. Mormon was a prophet who was commanded to assemble the plates and write the history of his people from all the records they kept. The record Mormon assembled and edited began with Lehi and his family in Jerusalem during the time of Jeremiah in the Old Testament, and continued up to Mormon’s own time. When Mormon had done what he could, he passed the record he made, along with the rest of the records of his people, to his son Moroni. Moroni included a history of people called the Jaredites, and then ended the record with his own book. When he was finished, Moroni was commanded to bury the plates and thus protect them until the time would come to retrieve them and translate the record into the current language of the people. It was also Moroni who appeared to Joseph Smith and first told Joseph about the plates, showed them where they were, and eventually turned them over to Joseph for translation. When the translation was complete, Moroni took the plates back from Joseph, and as far as we know, he has charge of them to this day.