In Canada, spodumene (LiAlSi2O6) is the most common and widely explored among the lithium hard rocks. Its abundance and exploration potential have led to significant efforts in its study and development. It is noted that spodumene from Canada typically shows heterogeneous nature and simple mineralogy. The chemical components of spodumene pegmatites across different projects remain highly similar. The primary challenge in spodumene concentration lies in effectively separating it from sodic plagioclase (Na-feldspar) that shares similar crystal structure and has similar chemical composition with spodumene. This chapter presents lignosulphonate as depressant facilitating the separation of spodumene from Na-feldspar. The research employed surface chemistry, notably time-of-flight secondary ion mass spectrometry (ToF-SIMS) to explore the complexities of feldspar depression. The insights gleaned underscore potential challenges that may arise in industrial projects within Canada.