Egyptian authorities have unveiled a well-preserved mummy of a woman inside a previously unopened coffin in Luxor in southern Egypt dating back more than 3,000 years.

Key points:

• First known time authorities unveiled previously unopened sarcophagus before international media
• On same day, authorities revealed another tomb belonging to Thar-Irkhet-if
• Inside that tomb, there were paintings showing its owner and family

The sarcophagus, an ancient coffin, was one of two found earlier this month by a French-led mission in the northern area of El-Asasef, a necropolis on the western bank of the Nile.

The first one had been opened earlier and examined by Egyptian antiquities officials.

"One sarcophagus was rishi-style, which dates back to the 17th dynasty, while the other sarcophagus was from the 18th dynasty," Minister of Antiquities Khaled Al Anani said.

"The two tombs were present with their mummies inside."

Egypt has revealed more than a dozen ancient discoveries this year.

The Eighteenth Dynasty dates back to the 13th century BC, a period noted for some of the most well-known Pharaohs, including Tutankhamen and Ramses II.

It was the first known time authorities had opened a previously unopened sarcophagus before international media.

About 300m of rubble was removed over five months to uncover another tomb opened on the same day.

Earlier in the day, authorities also revealed in the same area the tomb of the overseer of the mummification shrine identified as Thaw-Irkhet-if.

The tomb contained five coloured masks and about 1,000 Ushabti statutes — the miniature figurines of servants to serve the dead in the afterlife.

Wooden masks are displayed outside the newly discovered tomb.

About 300 metres of rubble was removed over five months to uncover the tomb, which contained coloured ceiling paintings depicting the owner and his family.

The tomb, which also contains mummies, skeletons and skulls, dates back to the middle-kingdom, almost 4,000 years ago, but was reused during the late period.

Egypt hopes to reignite travellers' interest in the country.

Ancient Egyptians mummified humans to preserve their bodies for the afterlife, while animal mummies were used as religious offerings.

Egypt has revealed more than a dozen ancient discoveries since the beginning of this year.

The country hopes these discoveries will brighten its image abroad and revive interest among travellers who once flocked to its iconic pharaonic temples and pyramids but who have shunned the country since its 2011 political uprising.