The miners followed Enki's plan.  First, they drastically reduced their shipments of gold to Ninurta in Badtibira.  

Enlil sent Ninurta to investigate and Enki returned to the mines.  At the mines, Ninurta and Ennugi heard miner-complaints.  The miners "were backbiting and lamenting, in the excavations they were grumbling.  'Unbearable is the toil.'" 

Invite Enlil to the mines, Enki suggested to Ninurta, Let the Commander see how the miners suffer. 

When Enlil and his Vizier, Nusku, arrived, "'Let us unnerve Enlil'...mine-working heros shouted.  'Of the heavy work let him relieve us.  Let us proclaim war, with hostilities let us gain relief.'  To their tools they set fire, fire to their axes they put."  They held Mine Boss Ennugi hostage and, with tools as torches, surrounded the house Enlil occupied.

Enlil beamed King Anu to shuttle to Earth and execute the miners' leaders and their instigator (implying Enki).   Anu arrived in Africa and conducted an inquiry.  But no miner revealed leaders or instigator.  The King also sympathized with the miners

 Ninurta wanted better equipment for new miners from Nibiru.  

         Enki told Ningishzidda, "Let us create a Lulu, a primitive worker, the hardship to take over, let the Being the toil of the Anunnaki [astronaut-pioneers] carry on his back....  The Being that we need, it already exists.  All that we have to do is put on it the mark of our essence [ie, our genes], thereby a Lulu, a Primitive Worker shall be created!" [The Lost Book of Enki, pages 124 -127]

Enki showed the apemen to Enlil and Ninurta, "Ningishziddha, my son, their fashioning essence [DNA structure] has tested; akin to ours it is, like two serpents it is entwined. When with our life essence shall be combined, our mark upon them shall be, a Primitive Worker shall be created. Our commands will he understand. Our tools he will handle, the toil in the excavations he shall perform, to the Anunnaki in the Abuzu [Africa] relief shall come." [Sitchin, Z., 2002, The Lost Book of Enki, page 130]