Concordian mines / Legends The Concordian mines were a series of mines constructed on Mandalore ' s moon , Concordia . Used by the Mandalorians to mine for ore deposits of the nearly indestructible " beskar " iron , the sheer scope of the operation and the vast number of mining facilities took a toll on Concordia ' s natural forests , nearly destroying them . By the time of the Clone Wars , Concordia ' s mines were largely believed to be abandoned and inactive by the government of the New Mandalorians . However , they continued to be used in secret by the radical Mandalorian splinter faction known as the Death Watch , who transformed one of the facilities as a base of operations and utilized the mine ' s industrial equipment in the creation of armor and jetpacks for their Death Watch troops . During an investigation into the Death Watch that led him to the Concordian mines , Jedi Master Obi - Wan Kenobi discovered the facilities were still functioning and engaged a number of Death Watch soldiers both within the underground mines , and at their base on the surface . History . Centuries prior to the rise of the Galactic Empire , the Mandalorians of Mandalore transformed the previously agricultural moon of Concordia into a mining base in search of " beskar " iron ore — a nearly indestructible metal believed unique to Mandalore and its moon , so strong it was capable of withstanding blows from a lightsaber . Ugly mines scarred the surface of Concordia in such great numbers that the " beskar " mining operation threatened to destroy the native forests of Concordia . By the beginning of the galaxy - wide conflict between the Galactic Republic and the Confederacy of Independent Systems known as the Clone Wars , the mines of Concordia were believed by the leadership of the New Mandalorians to be abandoned and inactive . Without the large - scale strip - mining , Concordia ' s forests were allowed to flourish again , and by 21 BBY , had truly begun to make a comeback . In secret , however , the radical Mandalorian splinter group known as the Death Watch had taken up residence in one of Concordia ' s mines , turning it into a covert base of operations . There , the Death Watch utilized the abandoned industrial machinery within the mine in the creation of armor , jetpacks , and weapons for their soldiers . During his investigation into the Death Watch threat on Mandalore , Jedi Master Obi - Wan Kenobi traveled to Concordia with New Mandalorian leader , Duchess Satine Kryze , and set his sights on the supposedly inactive mines . While surveying the mines for evidence of activity , Kenobi found that they were indeed still functional ; the Jedi Master was attacked by a pair of Death Watch troops within the mine , incapacitated , and captured . Before he could be killed , however , Kenobi was rescued by Duchess Kryze and the two fled the underground mine for the surface . There , they encountered further Death Watch forces at their base , and Kenobi battled several Death Watch warriors and the group ' s leader , Pre Vizsla , before being forced to escape in the face of overwhelming enemy numbers . Even after their discovery at the hands of Master Kenobi , the Death Watch continued to operate from their base within the mines . Behind the scenes . The mines of Concordia first appeared in " Star Wars " canon in the twelfth episode of the ' , entitled " The Mandalore Plot . " They appeared again in the later fourteenth episode of that season , " Duchess of Mandalore . "