Their findings, which include a mummification workshop and a shaft, used as a communal burial place, are located at the vast Saqqara necropolis part of the Memphis, a UNESCO World Heritage Site.
Memphis was the first capital of ancient Egypt and its large necropolis houses a wide range of temples and tombs as well as the three pyramids of Giza.
The latest find, announced at a press conference Saturday, belongs to the Saite-Persian Period, from 664-404 B.C. The site, which lies south of Unas pyramid, was last excavated more than 100 years ago, in 1900.
Among the artifacts found were a gilded silver mummy mask, fragments of mummy cartonnages, canopic cylindrical jars and marl clay and faience cups. Many will be displayed in the under-construction Grand Egyptian Museum, the first phase of which is expected to be inaugurated later this year.
Down the 30-meter-deep shaft lie several mummies, wooden coffins and sarcophagi. The shaft is comprised of burial chambers carved into the bedrock lining the sides of two hallways.
In mummification workshop, an embalmer's cachette was found that archaeologists believe will reveal more about the oils used in the mummification process in the 26th Dynasty.
"We are in front of a goldmine of information about the chemical composition of these oils," Archaeologist Ramadan Hussein said at the press conference, reports the Associated Press.
"It's only the beginning," added Antiquities Minister Khaled al-Anani.
Egypt has gone at great length to revive its vital tourism industry, still reeling from the political turmoil that followed a 2011 popular uprising. It hopes such discoveries, along with the inauguration of the museum at the Giza plateau, will help encourage more tourists to visit.
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