For a Kummer extension defined by the affine equation \(y^{m}=\prod _{i=1}^{r} (x-\alpha _i)^{\lambda _i}\) over an algebraic extension K of a finite field \(\mathbb {F}_q\) , where \(\lambda _i\in \mathbb {Z}\backslash \{0\}\) for \(1\le i\le r\) , \(\gcd (m,q) = 1\) , and \(\alpha _1,\ldots ,\alpha _r\in K\) are pairwise distinct elements, we propose a simple and efficient method to find all pure gaps at many totally ramified places. We introduce a bottom set of pure gaps and indicate that the set of pure gaps is completely determined by the bottom set. Furthermore, we demonstrate that a pure gap can be deduced from a known pure gap by easily verifying only one inequality. Then, in the case where \(\lambda _1 = \lambda _2 = \cdots = \lambda _r\) , we fully determine an explicit description of the set of pure gaps at many totally ramified places. This includes the scenario in which the set of these places contains the infinite place. Finally, we apply these results to construct multi-point algebraic geometry codes with good parameters. As one of the examples, a presented code with parameters \([74, 60, \ge 10]\) over \(\mathbb {F}_{25}\) yields a new record.
