We present the first results obtained recently with Gemini GMOS MOS spectroscopy of Ly-alpha emitters at redshift z = 5.7 - 6.0. We are carry out a spectroscopic study using Gemini GMOS of our sample of 259 candidates to galaxies at redshifts up to 6.0. The sample comprises: (i) 17 Ly-alpha (LAE) candidates at redshift 5.7, (ii) 4 LAE candidates at redshift 5.8, and (iii) 238 Lyman break galaxies and lower-redshift emitters candidates, found in our very deep imaging survey, by using the Suprime-Camera on the Subaru Telescope. The LAE objects were carefully selected from strong emission-line sources found in the NB8160 and IA8275 narrow and intermediate band filter images. The Lyman break galaxies were selected using the deep broad-band images. This project is allowing us to study in detail: (i) the evolution of the star formation density at redshift 5.7-6.0, and (ii) the galactic wind process at z up to 6.0 Finally, our central aim is to study -with GMOS IFU- the nature and kinematics of the out-flow process at very high redshift and to test our proposed "composite Hyper-Wind" scenario for the origin of extended blobs/halos.