A method of imaging a sample containing a target mineral species and other constituent species, the method comprising: a) generating a pump beam and a Stokes beam each comprising of a train of short pulses, the pump and Stokes beams having a tunable optical frequency difference; b) imposing a modulation on one of the pump beam and Stokes beam; c) probing an array of regions of the sample to be probed with the pump beam and Stokes beam jointly, said probing comprising varying the optical frequency difference between the pump beam and Stokes beam over an optical frequency range encompassing at least one known Raman resonance of the target mineral species, said probing further comprising detecting, for each frequency difference of said optical frequency range for each of the probed regions of said array, an optical response of the sample resulting from a transfer of said modulation between the pump beam and the Stokes beam, thereby obtaining hyperspectral data of said optical response over said optical frequency range for each of the probed regions; d) identifying a first subset of the probed regions as containing the target minera species through a correlation of the hyperspectral data with the at least one known Raman resonance of the target mineral species; e) identifying a second subset of the probed regions as containing one of the other constituent species through a correlation of the hyperspectral data with a non Raman-resonant contribution to said optical response resulting also from a transfer of said modulation between the pump and probe beams; f) building an image of the sample by mapping the first and second subsets of the probed regions thereon. a) generating a pump beam and a Stokes beam each comprising of a train of short pulses, the pump and Stokes beams having a tunable optical frequency difference; b) imposing a modulation on one of the pump beam and Stokes beam; c) probing an array of regions of the sample to be probed with the pump beam and Stokes beam jointly, said probing comprising varying the optical frequency difference between the pump beam and Stokes beam over an optical frequency range encompassing at least one known Raman resonance of the target mineral species, said probing further comprising detecting, for each frequency difference of said optical frequency range for each of the probed regions of said array, an optical response of the sample resulting from a transfer of said modulation between the pump beam and the Stokes beam, thereby obtaining hyperspectral data of said optical response over said optical frequency range for each of the probed regions; d) identifying a first subset of the probed regions as containing the target minera species through a correlation of the hyperspectral data with the at least one known Raman resonance of the target mineral species; e) identifying a second subset of the probed regions as containing one of the other constituent species through a correlation of the hyperspectral data with a non Raman-resonant contribution to said optical response resulting also from a transfer of said modulation between the pump and probe beams; f) building an image of the sample by mapping the first and second subsets of the probed regions thereon. <EOS>